Updated on 2024/04/08

写真a

 
Yagi Shigeyuki
 
Organization
Graduate School of Engineering Division of Science and Engineering for Materials, Chemistry and Biology Professor
School of Engineering Department of Applied Chemistry
Title
Professor
Affiliation
Institute of Engineering
Contact information
メールアドレス
Affiliation campus
Nakamozu Campus

Position

  • Graduate School of Engineering Division of Science and Engineering for Materials, Chemistry and Biology 

    Professor  2022.04 - Now

  • School of Engineering Department of Applied Chemistry 

    Professor  2022.04 - Now

Degree

  • 博士（工学） （ Kyoto University ）

Research Areas

  • Nanotechnology/Materials / Organic functional materials  / Phosphorescent Materials for Organic Light-emitting Diodes

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Electron device and electronic equipment  / Organic Materials for Organic Light-emitting Diodes

  • Nanotechnology/Materials / Functional solid state chemistry  / Organic Functional Dyes

  • Nanotechnology/Materials / Structural organic chemistry and physical organic chemistry  / Functional π-Electron Systems

  • Nanotechnology/Materials / Structural organic chemistry and physical organic chemistry

  • Nanotechnology/Materials / Functional solid state chemistry

  • Life Science / Bioorganic chemistry

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Electron device and electronic equipment

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Research Interests

  • OLED

  • 機能性パイ電子系

  • Functional Dyes

  • Synthetic Chemistry

  • Supramolecular Chemistry

  • Phosphorescent organometallic complexes

Research subject summary

  • 有機ＥＬ用りん光材料の創出

  • 有機白金錯体の新奇発光挙動の解明と応用

  • 強発光性有機イリジウム錯体の創出

  • りん光性有機金属デンドリマーを用いた溶液塗布型有機EL素子の創出

  • 優れた円偏光発光を示す発光材料の創出と発光デバイスへの応用

  • ユニークな構造を基盤とする新奇発光性機能性色素の創出

  • 近赤外発光機能性色素の創出

Research Career

  • Development of Organic Functional Materials for Organic Light-emitting Diodes

    2005.04 - Now 

  • Development of Organic Semiconductors for Organic Photovoltaics

    2008.04 - Now 

  • Development of Functional Dyes and Functional π-Electron Systems

    Individual

    2001.01 - Now 

  • Studies on Functional Materials for Circularly Polarized Organic Light-emitting Diodes

    Circularly polarized luminescence, Electroluminescence, Luminescent materials, Organic thin films, Organic light-emitting diodes  Joint Research in Japan

    2019.04 - Now 

Professional Memberships

  • 日本化学会

    1991.04 - Now   Domestic

  • アメリカ化学会

    1995.04 - Now   Overseas

  • 有機合成化学協会

    1995.04 - Now   Domestic

  • 近畿化学協会

    1998.01 - Now   Domestic

  • 光化学協会

    2000.04 - Now   Domestic

  • 色材協会

    2001.04 - Now   Domestic

  • 基礎有機化学会

    2010.07 - Now   Domestic

  • 高分子学会

    2016.04 - Now   Domestic

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Committee Memberships (off-campus)

  • President   Japan Society of Colour Material  

    2022.03 - Now 

Awards

  • 若い世代の特別講演

    1999.09   日本化学会  

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    Country：Japan

  • 色材協会創立75周年記念国際会議優秀論文賞

    2002.04   色材協会  

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    Country：Japan

  • 色材協会賞（論文）

    2011.11   社団法人色材協会  

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    Country：Japan

  • 色材協会賞（論文）

    2012.09   一般社団法人色材協会  

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    Country：Japan

  • 85th Japan Society of Colour Material (JSCM) Anniversary Conference, JSCM President Award

    2013.10  

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    Country：Japan

  • 2013年度第15回「貴金属に関わる研究助成金」ゴールド賞

    2014.04   TANAKAホールディングス株式会社  

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    Country：Japan

  • 色材協会賞（論文）

    2016.10   色材協会  

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    Country：Japan

  • 色材協会賞（論文）

    2018.09   色材協会  

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    Country：Japan

  • Journal of Japan Society of Coulor Material, Most Accessed Paper Award

    2021.03   Japan Society of Coulor Material  

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    Country：Japan

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Job Career (off-campus)

  • Osaka Prefecture University   College of Engineering, Department of Applied Materials Science   Assistant Professor

    1995.04 - 2000.12

  • Osaka Prefecture University   Graduate School of Engineering, Department of Applied Materials Science   Lecturer

    2001.01 - 2003.03

  • Osaka Prefecture University   Graduate School of Engineering, Department of Applied Materials Science   Associate Professor

    2003.04 - 2005.03

  • Massachusetts Institute of Technology   Department of Chemistry   Visiting Researcher

    2003.09 - 2004.08

  • Osaka Prefecture University   Graduate School of Engineering, Department of Applied Chemistry   Associate Professor

    2005.04 - 2007.03

  • Osaka Prefecture University   Department of Applied Chemistry, Graduate School of Engineering   Associate Professor

    2007.04 - 2016.03

  • Osaka Prefecture University   Graduate School of Engineering, Department of Applied Chemistry   Professor

    2016.04 - 2022.03

  • Osaka Metropolitan University   Graduate School of Engineering, Department of Applied Chemistry   Professor

    2022.04 - Now

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Papers

  • Enhancement of circularly polarized electroluminescence via reflection reversal under a magnetic field Reviewed

    Seika Suzuki, Yuta Yamamoto, Maho Kitahara, Ryuta Shikura, Shigeyuki Yagi, Yoshitane Imai

    Journal of Materials Chemistry C   12 ( 10 )   3430 - 3436   2024.03（ ISSN:20507526 ）

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    Publishing type：Research paper (scientific journal)   International / domestic magazine：International journal  

    Electroluminescent devices such as circularly polarised organic light-emitting diodes (CP-OLEDs) fabricated by conventional methods do not exhibit adequate circularly polarised electroluminescence (CPEL) with high circular polarisation. Therefore, new approaches for CPEL and CP-OLED systems are needed. We developed an external-magnetic-field-driven CP-OLED device that emits red CPEL by integrating an achiral optically inactive phosphorescent platinum(ii) porphyrin luminophore (PtOEP) in the emission layer (EML). This magnetic CP-OLED system can simultaneously emit circularly polarised light with opposite rotations from the EML in the N-up and S-up directions of the applied magnetic field. By utilising this mechanism that allows simultaneous emission upon the application of a magnetic field and the reflection-reversal property of circularly polarized light, we may suppress the decrease in both the luminosity and circular polarisation of CPEL. The direction of rotation of CPEL was successfully reversed by switching the Faraday geometry of the applied magnetic field. This approach can promote the development of novel CP-OLED devices.

    DOI： 10.1039/d4tc00048j

  • Water detection in organic solvents using a copolymer membrane immobilised with a fluorescent intramolecular charge transfer-type dye: effects of intramolecular hydrogen bonds. Reviewed

    Ami Morimoto, Kei Shimizu, Naoya Suzuki, Shigeyuki Yagi, Kenji Sueyoshi, Tatsuro Endo, Hideaki Hisamoto

    The Analyst   149 ( 6 )   1939 - 1946   2024.02（ ISSN:00032654 ）

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    Publishing type：Research paper (scientific journal)   International / domestic magazine：International journal  

    Numerous fluorescent dye-based optical sensors have been developed to detect water in organic solvents. However, only a few such sensors can detect water in polar solvents such as methanol or dimethyl sulfoxide, and their detection range is generally narrow. Therefore, in this study, a copolymer membrane incorporated with a pyridinium betaine dye (denoted PB1), which exhibited intramolecular charge transfer (ICT) characteristics, was developed to realise simple water detection in organic solvents. The pyridinium betaine structure, comprising intramolecular hydrogen bonds between the oxygen in the maleimide moiety and the hydrogen in the pyridinium, was vital for achieving efficient fluorescence emission. The membrane was prepared by copolymerising PB1 with the N,N-dimethyl acrylamide/acrylamide monomer on a glass plate, and the fluorescence in water-mixed organic solvents was investigated (λabs = 490 nm, λfl = 630 nm). The fluorescence intensity of the dye-immobilised membrane decreased with increasing water content of the organic solvents. The detection ranges in tetrahydrofuran, ethanol, methanol, and dimethyl sulfoxide were approximately <40, <40, <40, and <60 vol% water, respectively. In contrast, membranes based on a quaternary pyridinium dye (without intramolecular hydrogen bonds) did not detect water in methanol and dimethyl sulfoxide, although it was more sensitive than PB1 in the narrow region of low water concentration in THF. Theoretical calculations corroborated the importance of the pyridinium betaine structure in detecting water in organic solvents, with the increase in polarity and the formation of intermolecular hydrogen bonds between PB1 and water found to induce molecular rotation and fluorescence quenching.

    DOI： 10.1039/d3an02165c

    PubMed

  • Squaraine Appended with Benzodipyrrole for Fluorescent Sensing of Methanol: Exciton Coupling Controls Photophysical Properties Reviewed International coauthorship

    Ryuhei Sawada, Chinju Govind, Takeshi Maeda, Naoya Suzuki, Shigeyuki Yagi, Venugopal Karunakaran, Ayyappanpillai Ajayaghosh

    Chemistry – An Asian Journal   18 ( 24 )   e202300868   2023.11（ ISSN:1861-4728 ）

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    Publishing type：Research paper (scientific journal)   International / domestic magazine：International journal  

    The photophysical properties of dyes composed of two squaraine chromophores fused with a benzodipyrrole central moiety (BS1 and BS2), were investigated using steady‐state absorption, fluorescence, and transient absorption spectroscopy. The dyes exhibit solvent‐independent split electronic absorption due to exciton‐coupling, interestingly significant solvent‐dependent fluorescence properties were observed. In toluene, they emit from the lowest excited state, while in methanol, they show weak emission in the higher energy region. In the low‐temperature glass matrix, emission from the lowest excited state dominates similarly to that in toluene. The transient absorption spectra exhibit similar ground‐state bleaching in toluene and methanol, revealing the formation of delocalized excited states by exciton coupling independent of solvent. However, the excited state deactivates rapidly in ultrafast time scale in methanol, likely due to solvent interaction, leading to rapid non‐radiative deactivation. The PEG film doped with the exciton‐coupled bis‐squaraine shows a distinct fluorescence response to methanol vapor.

    DOI： 10.1002/asia.202300868

    PubMed

  • Tuning of external magnetic field-driven circularly polarized electroluminescence in OLED devices with a single achiral Pt(II) complex Reviewed

    Yoshitane Imai, Yuta Yamamoto, Seika Suzuki, Kengo Hara, Maho Kitahara, Shigeyuki Yagi

    Organic Electronics   122   106893   2023.11（ ISSN:15661199 ）

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    Publishing type：Research paper (scientific journal)   International / domestic magazine：International journal  

    This study developed an external magnetic field–driven organic light-emitting diode (OLED) that can emit tunable circularly polarized electroluminescence (CPEL) by incorporating achiral optically inactive phosphorescent organic Pt(II) luminophores in the emission layer. The experimental results showed that in the proposed magnetic circularly polarized OLED (MCP-OLED) system, the luminescent color (luminescent wavelength) of magnetic CPEL (MCPEL) can be controlled by adjusting the concentration of achiral organometallic Pt(II) luminophores in the emission layer. Furthermore, MCPEL inversion was controlled by switching the Faraday geometric configuration of the applied magnetic field.

    DOI： 10.1016/j.orgel.2023.106893

  • Development of novel deep-red/near-infrared fluorescent dyes based on a pyridinium–cyclic enolate betaine skeleton Reviewed

    Naoya Suzuki, Mao Saikusa, Yuichiro Hayashi, Takeshi Maeda, Shigeyuki Yagi

    Dyes and Pigments   216   111291   2023.08（ ISSN:01437208 ）

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    Authorship：Last author,　Corresponding author   Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：International journal  

    We have demonstrated a molecular design based on a pyridinium–cyclic enolate betaine (PCB) skeleton to develop new dyes exhibiting intense fluorescence in the deep-red/near-infrared (DR/NIR) region. The π-extension and the introduction of terminal substituents on the PCB skeleton played crucial roles in exhibiting intense DR/NIR fluorescence. Of particular note is that the N,N-diphenylamino derivative 5 showed intense deep-red emission (λPL = 667 nm, ΦPL = 0.91) in dichloromethane. Detailed experimental and theoretical analysis suggested that the π-conjugated part of 5 adopts a rigid quinoidal structure in the S1 state. These features should offer significant merits in further applications of long-wavelength fluorescent dyes.

    DOI： 10.1016/j.dyepig.2023.111291

  • Red–green–blue–yellow (RGBY) magnetic circularly polarized electroluminescence from iridium(III)-magnetic circularly polarized organic light-emitting diodes Reviewed

    Maho Kitahara, Kengo Hara, Seika Suzuki, Hiroshi Iwasaki, Shigeyuki Yagi, Yoshitane Imai

    Organic Electronics   119   106814   2023.08（ ISSN:15661199 ）

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    Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：International journal  

    In this study, optically inactive racemic phosphorescent iridium(III) luminophores were embedded into the luminescent active layer of each device, and red–green–blue–yellow (RGBY)-full-color external magnetic field-driven circularly polarized electroluminescence (CPEL) was generated from organic light-emitting diodes (OLEDs). The optically inactive organic iridium(III) luminophores selected for this study were IrIII(piq)3 and IrIII(ppy)3, composed of achiral organic ligands with homoleptic tris-cyclometalated structures, and IrIII(F2-ppy)2(pic) and IrIII(BT)2(acac), with heteroleptic bis-cyclometalated structures, where piq, ppy, F2-ppy, pic, BT, and acac refer to 1-phenylisoquinolinate, 2-phenylpyridinate, 2-(4′, 6′-difluorophenyl)pyridinate, picolinate, 2-phenylbenzo[d]thiazolate, and acetylacetonate, respectively. As a result, full-color magnetic CPELs (MCPELs) were successfully generated from each magnetic circularly polarized OLED (MCP-OLED) with high efficiency, despite the use of chirality-free organic iridium(III) luminophores. In this MCP-OLED system, the direction of rotation of the MCPEL can be controlled by the ligand environment of the IrIII luminophore (homoleptic or heteroleptic structure) and the direction of the applied magnetic field (Faraday geometry).

    DOI： 10.1016/j.orgel.2023.106814

  • Unveiling a new aspect of oxocarbons: open-shell character of 4- and 5-membered oxocarbon derivatives showing near-infrared absorption Reviewed

    Takeshi Maeda, Taishi Oka, Daisuke Sakamaki, Hideki Fujiwara, Naoya Suzuki, Shigeyuki Yagi, Tatsuki Konishi, Kenji Kamada

    Chemical Science   14 ( 8 )   1978 - 1985   2023.02（ ISSN:20416520 ）

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    Publishing type：Research paper (scientific journal)   International / domestic magazine：International journal  

    Oxocarbon derivatives consisting of 4- and 5-membered rings, referred to as croconaine and squaraine dyes and regarded as closed-shell molecules, are found to have an intermediate open-shell character from the experimental results of 1H-NMR, ESR spectroscopy, SQUID magnetometric analysis, and X-ray crystallography. We employed two chalcogenopyrylium moieties with O and S chalcogen atoms as substitutions on oxocarbons. The singlet-triplet energy gaps (ΔES-T) associated with the degree of diradical nature are smaller for croconaines than for squaraines and smaller for thiopyrylium than for pyrylium groups. The diradical nature impacts the electronic transition energy that decreased with a decreasing degree of diradical contribution. They exhibit substantial two-photon absorption in the region over 1000 nm. The diradical character y of the dye was determined experimentally from the observed one- and two-photon absorption peaks and the triplet energy level. The present finding provides new insight into diradicaloids with the contribution of non-Kekulé oxocarbon and also showcases the correlation between the electronic transition energy and their diradical character.

    DOI： 10.1039/D2SC06612B

    PubMed

  • External magnetic field-induced circularly polarized luminescence and electroluminescence from optically inactive thermally activated delayed fluorescence material 4CzIPN Reviewed

    Takumi Kuroda, Maho Kitahara, Shigeyuki Yagi, Yoshitane Imai

    Frontiers in Chemistry   11   1281168   2023（ ISSN:2296-2646 ）

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    Publishing type：Research paper (scientific journal)  

    An achiral optically inactive organic luminophore, 4CzIPN, exhibits circularly polarized thermally activated delayed fluorescence when photoexcited under an external magnetic field. By embedding this luminophore in an active emission layer, an external-magnetic-field-induced circularly polarized electroluminescent device is developed in this study. The Faraday geometry of the applied magnetic field completely controls the direction of rotation of 4CzIPN-derived circularly polarized luminescence and electroluminescence.

    DOI： 10.3389/fchem.2023.1281168

    PubMed

  • One-Photon and Two-Photon Absorption Properties of Multi-Branched Squaraine Dyes Comprised of Triphenylamine Cores and Ethynylene Linkers Reviewed

    Tay V. Nguyen, Takeshi Maeda, Tetsuya Matsuyama, Naoya Suzuki, Hiroyuki Nakazumi, Shigeyuki Yagi, Ayyappanpillai Ajayaghosh

    ChemPhotoChem   7 ( 11 )   e202300152   2023

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    Publishing type：Research paper (scientific journal)  

    We developed multi-branched π-conjugated systems using squaraine dyes with triphenylamine cores connected by ethynylene linkers. We investigated the influence of interbranch coupling between squaraine branches on their one-photon (OPA) and two-photon absorption (TPA) properties. These dyes with triphenylamine components showed a red-shifted one-photon absorption (OPA) compared to the precursor squaraine dyes. Among branched dyes, the lack of apparent splitting or shift in the absorption maxima, even as the absorption intensity increased with the number of chromophores, implies the presence of limited exciton coupling between the squaraine branches. The present squaraine dyes with triphenylamine cores exhibited a moderate TPA compared to the precursor squaraine without the triphenylamine core, due to the extended π-conjugation. Notably, both the 3-branched and 2-branched dyes demonstrated additional enhancement in the TPA response, surpassing that of the monochromophoric counterpart. This resulted in achieving a substantial TPA cross section of up to 3905 GM at 830 nm.

    DOI： 10.1002/cptc.202300152

  • New Boomerang-Shaped Host Materials for Phosphorescent Organic Light-Emitting Diodes Reviewed International coauthorship

    Ishita Neogi, Vibhu Darshan, Amrutham Linet, P.K. Anjalikrishna, Anjitha Sebastian, Gourab Mohanty, Ami Morimoto, C.H. Suresh, Shigeyuki Yagi, Yael Diskin Posner, Flavio Grynszpan, Narayanan Unni

    Synthetic Metals   291   117185   2022.12（ ISSN:0379-6779 ）

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    Publishing type：Research paper (scientific journal)   International / domestic magazine：International journal  

    Inspite of being a good triplet sensitizer, benzophenones are not useful as host materials for phosphorescent organic light-emitting diodes (PhOLEDs), primarily due to their low thermal stability. In this work, we have addressed this shortcoming by judicial tethering of benzoyl units onto different positions of a rigid Tröger's base (TB) scaffold to develop two new benzophenone tethered TBs, namely TB-Bz1, and TB-Bz2 as thermally stable host materials for applications in PhOLEDs. The TB-based host molecules were readily synthesized in good yields from the corresponding amines, and were fully characterized using various spectroscopic techniques. These TBs displayed high thermal decomposition temperatures above 320 °C, imparted by the rigid, non-planar, boomerang-shaped scaffold of the Tröger's base. It was further observed that the tethering position of the benzoyl units can significantly affect the photophysical properties of the TBs due to the twisting of the benzoyl unit with respect to the TB-core. This assumption was further confirmed by DFT simulations. Taking advantage of the high triplet energy of TBs (>2.8 eV), PhOLED devices were fabricated exploring TBs as the host material and Ir(ppy)3 as the dopant. The maximum external quantum efficiency of 6.1 %, and 6.9 % and maximum luminance of greater than 5000 cd/m2 were obtained using TBs as the host for the proof-of-concept PhOLED devices, where Ir(ppy)3 was employed as the dopant.

    DOI： 10.1016/j.synthmet.2022.117185

  • Synthesis of Blue Fluorescent Benzotriazoles Incorporating 2-(2-Hydroxyphenyl)-2&lt;i&gt;H&lt;/i&gt;-Benzotriazole Derivatives and their Optical Properties and Photostability Reviewed

    Toshiyuki UESAKA, Fumihisa KOMEYA, Shoujirou YOSHIDA, Takahito SHIMENO, Shigeyuki YAGI, Takeshi MAEDA

    Journal of the Japan Society of Colour Material   95 ( 8 )   220 - 228   2022.08（ ISSN:0010-180X ）

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    Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

    DOI： 10.4011/shikizai.95.220

  • Synthesis, Photophysical and Electrochemical Properties of Bis‐Squaraine Dyes Fused on Isomeric Benzodipyrrole Central Units (Chem. Asian J. 13/2022) Reviewed International coauthorship

    Ryuhei Sawada, Takeshi Maeda, Yuya Oda, Shigeyuki Yagi, Venugopal Karunakaran, Hideki Fujiwara, Ayyappanpillai Ajayaghosh

    Chemistry – An Asian Journal   17 ( 13 )   e202200227   2022.07（ ISSN:1861-4728 ）

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    Publishing type：Research paper (scientific journal)   International / domestic magazine：International journal  

    Exciton interactions are not only observed in assembled molecules but also in compounds with multiple chromophores referred to as superchromophores. We have developed isomeric bis-squaraine dyes as superchromophores in which two squaraine chromophores are fused onto the isomeric benzodipyrrole skeleton so as to regulate conformations and to reduce distances between two chromophores. The dyes with benzo[1,2-b:3,4-b’]dipyrrole and benzo[1,2-b:5,4-b’]dipyrrole moieties exhibited split electronic absorption originated from the intramolecular exciton interaction. The intensity of the split absorption bands varies in correlation with the orientation of chromophores. The isomeric dye with benzo[1,2-b:4,5-b’]dipyrrole moiety exhibited a near-infrared absorption associated with the resonance throughout two chromophores. Their electrochemical and spectroelectrochemical properties are distinct from those of monomeric dyes owing to electronic interactions between the two chromophores. Thus, the structural isomerism of the central skeleton significantly affects their optical properties as well as their electrochemical properties.

    DOI： 10.1002/asia.202200227

    PubMed

  • Synthesis and photophysical properties of photostable 1,8-naphthalimide dyes incorporating benzotriazole-based UV absorbers Reviewed

    Toshiyuki Uesaka, Tomoyuki Ishitani, Takahito Shimeno, Naoya Suzuki, Shigeyuki Yagi, Takeshi Maeda

    RSC Advances   12 ( 27 )   17350 - 17361   2022.06

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    Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：International journal  

    We developed a series of blue-emitting 1,8-naphthalimide dyes covalently attached to 2-(2-hydroxyphenyl)-2H-benzotriazoles that retard photodegradation of the fluorophore. The dyes displayed weaker fluorescence emissions than the parent 1.8-naphthalimide. Quantum chemical calculations suggested that the decreased fluorescence was caused by the nonradiative deactivation promoted through the excited state intramolecular proton transfer (ESIPT) in benzotriazole components. The dyes' phosphorescences in a degassed solution at 77 K were more efficient than that of the parent 1.8-naphthalimide, indicating a possible deactivation pathway through intersystem crossing. PMMA films doped with these dyes showed higher resistance against photoaging than the film doped with an equimolar mixture of constituent 1.8-naphthalimide and the benzotriazole derivatives. Thus, the covalently linked benzotriazole units slow fluorophore degradation not only by preferential absorption of harmful UV light, which is found in the film with a simple mixture of two components, but also by the nonradiative deactivation involved in benzotriazole units.

    DOI： 10.1039/d2ra02028a

    PubMed

  • External Magnetic Field Driven, Ambidextrous Circularly Polarized Electroluminescence from Organic Light Emitting Diodes Containing Racemic Cyclometalated Iridium(III) Complexes Reviewed

    Kengo Hara, Ami Morimoto, Kana Matsudaira, Satoko Suzuki, Shigeyuki Yagi, Michiya Fujiki, Yoshitane Imai

    CHEMPHOTOCHEM   6 ( 4 )   e202100253   2022.01（ ISSN:2367-0932 ）

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    Publishing type：Research paper (scientific journal)  

    This work reports the development of external magnetic field (EMF) driven, ambidextrous, circularly polarized electroluminescence (CPEL) devices, by embedding racemic mixtures of phosphorescent organoiridium(III) emitters in the active emitting layer. Homoleptic tris-cyclometalated Ir(III)(ppy)(3) and heteroleptic bis-cyclometalated Ir(III)(ppy)(2)(acac) (ppy = 2-phenylpyridinate, acac = acetylacetonate) were used as the representative organoiridium(III) compounds. Chiroptical inversion of CPEL was influenced by the ligand environment in the Ir(III) complexes (homoleptic or heteroleptic), as well as the Faraday geometry.

    DOI： 10.1002/cptc.202100253

  • Theoretical Design of Blue-Color Phosphorescent Complexes for Organic Light-Emitting Diodes: Emission Intensities and Nonradiative Transition Rate Constants in Ir(ppy)<inf>2</inf>(acac) Derivatives Reviewed

    Shiro Koseki, Masaki Yoshii, Toshio Asada, Yuichi Fujimura, Takeshi Matsushita, Shigeyuki Yagi

    Journal of Physical Chemistry A   125 ( 50 )   10604 - 10614   2021.12（ ISSN:1089-5639 ）

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    Publishing type：Research paper (scientific journal)  

    Theoretical calculations of phosphorescent spectra and nonradiative transition (NRT) rate constants for S1 ⇝ T1, T1 ⇝ S0, and S1 ⇝ S0 were carried out to determine the best candidate for a blue-color phosphorescent complex among several derivatives of bis(2-phenylpyridine)(acetylacetonate)iridium(III). The geometries of the ground state (S0), the lowest triplet state (T1), and the lowest excited singlet state (S1) were optimized at the levels of density functional theory, in which B3LYP functionals and SBKJC+p basis sets were used. The NRT rate constants were derived by using a generating function method within the displaced harmonic oscillator model. The results of the calculation for phosphorescence showed that the introduction of F and/or CN substituents at the 4′/6′-th and 5′-th sites in 2-phenylpyridinate (ppy) ligands, respectively, causes a blue shift of the emission spectra. They also suggest that Ir(5-CN,6-F-ppy)2(acac), denoted 3(56) in the text, is a good candidate for a blue-color phosphorescent complex because a blue shift of emission spectra and a moderate intensity are obtained for phosphorescence and, furthermore, this complex is calculated to have a large rate constant for S1 ⇝ T1 and relatively smaller rate constants for T1 ⇝ S0 and S1 ⇝ S0 based on the calculations of spin–orbit coupling and nonadiabatic coupling constants.

    DOI： 10.1021/acs.jpca.1c08261

    PubMed

  • Red-Green-Blue-Yellow (RGBY) Magnetic Circularly Polarised Luminescence (MCPL) from Optically Inactive Phosphorescent Ir(III) Complexes Reviewed

    Maho Kitahara, Seika Suzuki, Kana Matsudaira, Shigeyuki Yagi, Michiya Fujiki, Yoshitane Imai

    ChemistrySelect   6 ( 41 )   11182 - 11187   2021.11

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    Publishing type：Research paper (scientific journal)  

    The development of phosphorescent organometallic molecules, capable of full-colour circularly polarised luminescence with a controlled polarised sign in the absence of any chiral chemical influences, presents a significant scientific and engineering challenge. The current study describes the first red-green-blue-yellow (RGBY) coloured, nearly mirror-image magnetic circularly polarised luminescence (MCPL) in dimethyl sulfoxide and dichloromethane, from four optically inactive Iridium(III) complexes viz. Ir(III)(piq)3, Ir(III)(ppy)3, Ir(III)(F2-ppy)2(pic), and Ir(III)(BT)2(acac), bearing achiral organic cyclometalated and ancillary ligands. The absolute value of the anisotropy factors, |gMCPL|, ranging from 0.9×10−3 to 2.5×10−3 in the presence of an external 1.6 T magnetic field was nearly identical to the enantiomerically pure Iridium (III) complexes at zero-magnetic fields. Unexpectedly, when the same north-up/south-up Faraday geometries were used, the MCPL signs were inverted due to the achiral ligands.

    DOI： 10.1002/slct.202103117

  • Novel group 14 element-bridged bithiophene dimers appended with terminal electron-withdrawing groups: Red-to-near infrared fluorescence and efficient photosensitized singlet oxygen generation Reviewed

    Yuichiro Hayashi, Ami Morimoto, Ayaka Ban, Yusuke Goto, Takeshi Maeda, Toshiaki Enoki, Yousuke Ooyama, Shigeyuki Yagi

    DYES AND PIGMENTS   193   109498   2021.09（ ISSN:0143-7208 ）

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    Publishing type：Research paper (scientific journal)  

    A series of group 14 element bridged bithiophene dimers bearing dicyanovinyl (DC) or thiobarbiturylmethylene (TB) electron-withdrawing groups at the molecular termini (series E-1a and series E-1b; E = C, Si, and Ge) were developed as red absorbing singlet oxygen (1O2) photosensitizing dyes. These dyes exhibited broad and strong absorption in the red-to-deep red regions and efficient red-to-NIR fluorescence (photoluminescence quantum yield phi PL; 0.32-0.45 in dichloromethane). The terminal TB groups led to more red-shifted electronic absorption and fluorescence emission than the DC groups, owing to more intense intramolecular charge transfer. The 1O2 generation photosensitization abilities of series E-1a and series E-1b were evaluated by the 1,3-diphenylisobenzofuran method, and large 1O2 generation quantum yields (phi Delta) were obtained upon irradiation of 630 nm light, ranging from 0.35 to 0.68 in dichloromethane. Therefore, these dyes show fluorescence properties as well as 1O2 generation photosensitization ability. Introduction of bromo groups at the 3,3 '-positions in Si-1a and Si-1b afforded the new potential photosensitizers Si-2a and Si-2b that accompanied blue-shifted electronic absorption as well as blue-shifted fluorescence emission with the low phi PL. Unfortunately, as Si-2a exhibited quite low absorptivity in the red region, 1O2 generation photosensitization with 630 nm light was not evaluated for Si-2a. On the other hand, Si-2b showed significantly efficient 1O2 generation photosensitization upon irradiation of 630 nm light (phi Delta; 0.88). Considering the result of theoretical calculations showing that the bromo groups effectively contribute to the frontier orbitals, these bromo substituents should facilitate the intersystem crossing from the excited singlet state to the triplet excited state through the strong spin-orbit coupling.

    DOI： 10.1016/j.dyepig.2021.109498

  • Luminescent Materials for Organic Light-Emitting Diodes Reviewed

    Shigeyuki Yagi

    Progress in the Science of Functional Dyes   561 - 601   2021.04（ ISBN:9789813343924 ）

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    Nowadays, an organic light-emitting diode (OLED), consisting of nanoorder luminescent and semiconductive organic thin films, attracts considerable interest from the viewpoint of application to flat panel displays and illumination devices. Among the constituent materials of OLEDs, emitting materials play an important role in determination of the device performance such as luminous efficiencies and chromaticity coordinates of electroluminescence. Here, luminescent dyes and related compounds used as emitters in OLEDs are reviewed in accordance with the mechanism of the exciton generation. First, fluorescent emitters based on organic dyes and π-conjugated polymers are focused on, and then the topic moves to phosphorescent organometallic emitters affording high device efficiencies. In the last part, organic TADF emitters are reviewed, which can realize the 100% internal quantum efficiency of electroluminescence in theory without the employment of precious metal-containing organometallic structures.

    DOI： 10.1007/978-981-33-4392-4_16

  • Magnetic Circularly Polarized Luminescence from Pt<sup>II</sup>OEP and F<inf>2</inf>-ppyPt<sup>II</sup>(acac) under North-up and South-up Faraday Geometries Reviewed

    Kana Matsudaira, Yuki Mimura, Junichi Hotei, Shigeyuki Yagi, Ken ichi Yamashita, Michiya Fujiki, Yoshitane Imai

    Chemistry - An Asian Journal   16 ( 8 )   926 - 930   2021.04（ ISSN:1861-4728 ）

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    The magnetic circularly polarized luminescence (MCPL) and photoluminescence (PL) spectra of achiral (2,3,7,8,12,13,17,18-octaethylporphyrinato)platinum(II), PtOEP, and [2-(4′,6′-difluorophenyl)pyridinato-N,C2′]platinum(II) acetylacetonate-O,O, F2-ppyPt(acac), in toluene and dichloromethane solutions were recorded under an external magnetic field of 1.6 T with N-up and S-up Faraday geometries. The MCPL signs of PtOEP and F2-ppyPt(acac) were controlled solely by changing the N-up and S-up geometries. The MCPL/PL wavelengths of F2-ppyPt(acac) in solutions were varied by the ratio of the monomeric and excimeric species.

    DOI： 10.1002/asia.202100172

    PubMed

  • Sign inversion of magnetic circularly polarized luminescence in Iridium(iii) complexes bearing achiral ligands Reviewed

    Kana Matsudaira, Atsushi Izumoto, Yuki Mimura, Yoshiro Kondo, Satoko Suzuki, Shigeyuki Yagi, Michiya Fujiki, Yoshitane Imai

    Physical Chemistry Chemical Physics   23 ( 9 )   5074 - 5078   2021.03（ ISSN:1463-9076 ）

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    Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：International journal  

    Optically inactive, paramagnetic Ir(iii)(ppy)3and Ir(iii)(ppy)2(acac) (ppy: 2-phenylpyridinate and acac: acetylacetonate) showed nearly mirror-symmetric magnetic circularly polarised luminescence (MCPL) spectra in dilute dichloromethane and dimethyl sulfoxide under N-up and S-up geometries in a 1.6-T magnetic field. However, the MCPL signs of Ir(iii)(ppy)3and Ir(iii)(ppy)2(acac) under the same N-up (or S-up) Faraday geometry were opposite to each other when one ppy was replaced with an acac. This ligand exchange approach provides facile control of the MCPL sign, irrespective of the Faraday geometry.

    DOI： 10.1039/d0cp05775d

    PubMed

  • Synthesis of novel π-extended D–A–D-type dipyrido[3,2-a:2′,3′-c]phenazine derivatives and their photosensitized singlet oxygen generation Reviewed

    Yuichiro Hayashi, Ami Morimoto, Takeshi Maeda, Toshiaki Enoki, Yousuke Ooyama, Yasunori Matsui, Hiroshi Ikeda, Shigeyuki Yagi

    New Journal of Chemistry   45 ( 4 )   2264 - 2275   2021.01（ ISSN:1144-0546 ）

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    <p>Electron donor–acceptor–donor (D–A–D) π-conjugated molecules based on dipyrido[3,2-<italic>a</italic>:2′,3′-<italic>c</italic>]phenazine (dppz) were developed as photosensitizers for singlet oxygen generation.</p>

    DOI： 10.1039/d0nj05526c

  • NIR fluorescence of A–D–A type functional dyes modulated by terminal Lewis basic groups Reviewed

    Ami Morimoto, Yuichiro Hayashi, Takeshi Maeda, Shigeyuki Yagi

    Dyes and Pigments   184   2021.01（ ISSN:0143-7208 ）

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    © 2020 Elsevier Ltd Near-infrared (NIR) emitting functional dyes have been attracting considerable attention because they are useful in the fields of cellular imaging, security application, energy conversion, and so on. In this study, to develop NIR fluorescent dyes with high photoluminescence (PL) quantum yields (ΦPL), novel acceptor–donor–acceptor (A–D–A) type π-conjugated molecules have been prepared, where dimeric dithienosilole (DTS) and freebase or quaternized 1-pyridylacryronitrile are involved as the D and A moieties, respectively. The freebase dye exhibited red fluorescent emission at 654 nm with ΦPL of 0.10 in dichloromethane at rt, whereas the methylation of the pyridine moieties at the molecular termini led to a significant red shift of the emission to the NIR region (PL maximum λPL; 822 nm), accompanied by improvement of a high ΦPL of 0.20 in dichloromethane at rt. The results of density functional theory (DFT) and time-dependent DFT calculations indicated that the considerable red shift of the emission band of the quaternized dye originates from effective intramolecular charge transfer from the DTS donor to the terminal pyridiniums and that the high value of ΦPL is brought about by minimal structural relaxation upon photoexcitation. NIR emission was also obtained when the freebase dye was placed under acidic conditions: protonation at the Lewis basic pyridine moieties brought about halochromic response of PL to yield red-shifted emission (λPL; 755 nm), when trifluoroacetic acid was added to the dichloromethane solution.

    DOI： 10.1016/j.dyepig.2020.108768

  • Photophysical properties of 4-(5-methylthiophen-2-yl)pyridinium–cyclic enolate betaine dyes tuned by control of twisted intramolecular transfer Reviewed

    Yuichiro Hayashi, Naoya Suzuki, Takeshi Maeda, Hideki Fujiwara, Shigeyuki Yagi

    New Journal of Chemistry   45 ( 22 )   9770 - 9779   2021（ ISSN:1144-0546 ）

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    In this paper, thienylpyridinium-cyclic enolate betaine (TPB) dyes were reported as unique skeletons of fluorescent donor-acceptor type molecules. TPB derivatives with five-membered cyclic enolates are coplanar because of the intramolecular hydrogen bond formation between the carbonyl oxygens of the cyclic enolate and the α-hydrogens of the pyridinium ring. However, a six-membered cyclic enolate leads to a pre-twisted structure due to the steric hindrance. TPB derivatives with alkylene-bridged cyclic enolates exhibited obvious fluorescence quenching through the twisted intramolecular charge transfer (TICT) process in solution. In contrast, electron-deficient cyclic enolates suppressed the TICT process, and thus relatively intense emission was observed. This report also discusses deactivation processes in the excited state of each TPB derivative by theoretical calculations to support the experimental results. These observations present a rational design strategy to control the TICT of TPB derivatives.

    DOI： 10.1039/D1NJ00714A

  • Fluorescent 2-phenyl-2H-benzotriazole dyes with intramolecular N–H···N hydrogen bonding: Synthesis and modulation of fluorescence properties by proton-donating substituents Reviewed

    Toshiyuki Uesaka, Tomoyuki Ishitani, Ryuhei Sawada, Takeshi Maeda, Shigeyuki Yagi

    Dyes and Pigments   183   2020.12（ ISSN:0143-7208 ）

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    © 2020 Elsevier Ltd A series of 2-(2-phenyl)benzotriazole derivatives having amino, N-methyl amino, and acetamido groups on the ortho position of the phenyl group were synthesized to elucidate the effects of amino/amido substitutions on the molecular structures and photophysical properties. 1H NMR spectra and DFT calculations of the present dyes revealed the formation of N–H∙∙∙N intramolecular hydrogen bonds between benzotriazole and amino/amide groups in the ground state. Amino-functionalized dyes showed absorption bands that were assigned to HOMO-LUMO transition with a partial charge-transfer feature. The dye with an acetoamido group in which the acidity of NH proton was increased by the effect of electron-withdrawing acetyl groups exhibited absorption bands attributable to intramolecular hydrogen-bonded “closed” conformers in CHCl3 and non-hydrogen-bonded “open” conformers in DMSO. In comparison to 2-phenylbenzotriazole, which had no acidic proton involved in intramolecular hydrogen bonding, the present derivatives exhibited weak fluorescence emissions with quite low quantum yields, suggesting that non-radiative deactivation of ESIPT states also operated in the N–H∙∙∙N hydrogen bonded 2-phenylbenzotriazoles just as in O–H∙∙∙N intramolecular hydrogen-bonded 2-hydroxyphenylbenzotriazoles, which are known as UV absorbers. Taking a closer look at the fluorescence spectra, dyes with amino and N-methylamino groups showed faint but dual emissions from charge-transfer excited states in CHCl3 and blue-shifted single emission in DMSO. Fluorescence emissions of the acetamido-functionalized dye were unimodal in each solvent and stronger than those of amino-functionalized dyes. Thus, the fluorescence properties of these dyes depended on substitutions at amino groups. The luminescence of these derivatives was enhanced in the polymer matrix in which conformation changes and molecular motions were suppressed. Dye-doped polymer films have absorption bands in the UV range (360–400 nm) and emitted at the visible region (450–510 nm), and thus could be used as organic materials for light conversion films that convert UV light into visible light.

    DOI： 10.1016/j.dyepig.2020.108672

  • Hydrogen bond-rigidified planar squaraine dye and its electronic and organic semiconductor properties Reviewed International coauthorship

    Takeshi Maeda, Andreas Liess, Astrid Kudzus, Ana Maria Krause, Matthias Stolte, Hitoshi Amitani, Shigeyuki Yagi, Hideki Fujiwara, Frank Würthner

    Chemical Communications   56 ( 68 )   9890 - 9893   2020.09（ ISSN:1359-7345 ）

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    © The Royal Society of Chemistry. The one-step reaction of a dicyanovinyl-functionalized squaric acid with Fischer bases afforded C2v symmetric squaraine dyes with rigid planar structures due to intramolecular N-H⋯O hydrogen bonds. Dense molecular packing, decrease of HOMO level, and sufficient thermal stability for sublimation enabled vacuum-processed OTFTs with hole mobility up to 0.32 cm2 V-1 s-1 and current on/off ratio of 106. This journal is

    DOI： 10.1039/d0cc04306k

    PubMed

  • Synthesis and Fluorescence Property of 5-amino-2-(2-hydroxyphenyl)-2<i>H</i>-benzotriazole Derivatives Reviewed

    Toshiyuki UESAKA, Shigeyuki YAGI, Takeshi MAEDA

    Journal of the Japan Society of Colour Material   93 ( 6 )   194 - 201   2020.06（ ISSN:0010-180X ）

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    DOI： 10.4011/shikizai.93.194

  • Room-Temperature Phosphorescence-active Boronate Particles: Characterization and Ratiometric Afterglow-sensing Behavior by Surface Grafting of Rhodamine B Reviewed

    Mitsuki Hoshi, Ryuhei Nishiyabu, Yuichiro Hayashi, Shigeyuki Yagi, Yuji Kubo

    Chemistry - An Asian Journal   15 ( 6 )   787 - 795   2020.03（ ISSN:1861-4728 ）

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    © 2020 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim We found that boronate particles (BP), as a self-assembled system prepared by sequential dehydration of benzene-1,4-diboronic acid with pentaerythritol, showed greenish room-temperature phosphorescence (RTP). This emission was observed in both solid and dispersion state in water. To understand the RTP properties, X-ray crystallographic analysis, and density functional theory (DFT) and time-dependent DFT at M06-2X/6-31G(d,p) level were performed using 3,9-dibenzo-2,4,8,10-tetraoxa-3,9-diboraspiro[5.5]undecane (1) as a model compound. Our interest in functionalizing the RTP-active particles led us to graft Rhodamine B onto their surface. The resulting system emitted a dual afterglow via a Förster-type resonance energy transfer process from the BP in the excited triplet state to Rhodamine B acting as an acceptor fluorophore. This emission behavior was used for ratiometric afterglow sensing of water content in THF with a detection limit of 0.28 %, indicating that this study could pave the way for a new strategy for developing color-variable afterglow chemosensors for various analytes.

    DOI： 10.1002/asia.201901740

    PubMed

  • Starburst-Type Triarylphosphine Oxide Trimers Forming a Stable Amorphous n-Type Layer in Solution-Processed Multilayer OLED Reviewed

    Ryousuke Hiraoka, Naoki Okamura, Takeshi Maeda, Shigeyuki Yagi

    Mol. Cryst. Liq. Cryst. Taylor & Francis   686 ( 1 )   78 - 83   2019.10

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  • High Lycopene of Tomato Fruit by Blue-Violet Fluorescent Polymer Film Reviewed

    Toshiyuki UESAKA, Satoshi ENDO, Takashi MAEDA, Hajime FURUKAWA, Shigeyuki YAGI, Hiroyuki NAKAZUMI

    Journal of the Japan Society of Colour Material   92 ( 9 )   253 - 259   2019.09（ ISSN:0010-180X ）

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    DOI： 10.4011/shikizai.92.253

  • Exergonic Intramolecular Singlet Fission of an Adamantane-Linked Tetracene Dyad via Twin Quintet Multiexcitons Reviewed

    Yasunori Matsui, Shuhei Kawaoka, Hiroki Nagashima, Tatsuo Nakagawa, Naoki Okamura, Takuya Ogaki, Eisuke Ohta, Seiji Akimoto, Ayana Sato-Tomita, Shigeyuki Yagi, Yasuhiro Kobori, Hiroshi Ikeda

    Journal of Physical Chemistry C   123 ( 31 )   18813 - 18823   2019.08（ ISSN:1932-7447 ）

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    © 2019 American Chemical Society. An adamantane-linked tetracene dyad (Tc-Ad-Tc) undergoes exergonic intramolecular singlet fission (SF), producing long-lived (τ = 175 μs) and high-energy (2 × 1.03 eV) multiexciton. Time-resolved absorption, fluorescence decay, and electron paramagnetic resonance (EPR) spectroscopic analysis revealed that the long-lived triplet species is generated in this system via a correlated triplet pair having singlet and quintet characteristics. Time-resolved EPR analysis revealed formation of syn and anti conformers in the quintet, i.e., 5(3Tc-Ad-3Tc)*. The quintet generation requires small conformational motion to induce singlet-quintet spin relaxation. The presence of aliphatic linkages, like the rigid adamantane group, may enable effective conservation of intrinsic high S1 and T1 levels of the original monomers, moderate bridge-mediated σ-πinteraction leading to exergonic intramolecular SF involving 1Tc*-Ad-Tc → 1(3Tc-Ad-3Tc)*, and prevention of undesirable triplet-triplet annihilation, finally result in long-lived and high-energy multiexciton.

    DOI： 10.1021/acs.jpcc.9b04503

  • Starburst-type triarylphosphine oxide trimers forming a stable amorphous n-type layer in solution-processed multilayer OLED Reviewed

    Ryousuke Hiraoka, Naoki Okamura, Takeshi Maeda, Shigeyuki Yagi

    Molecular Crystals and Liquid Crystals   686 ( 1 )   78 - 83   2019.06（ ISSN:1542-1406 ）

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    © 2019, © 2019 Taylor & Francis Group, LLC. Novel starburst-type triphenylphosphine oxide trimers PO-1 and PO-2 were synthesized aimed at application as an electron-transporting material for multilayer organic light-emitting diodes (OLEDs). They showed high glass transition temperatures (Tg; 175 and 205 °C, respectively) and high lowest triplet energies (T1; 2.81 and 2.78 eV, respectively). Their high solubility in 2-propanol allowed us to fabricate multilayer OLEDs by solution processing, and a double-emitting layer OLED consisting of poly(9-vinylcarbazole)-based p-type and PO-1-based n-type layers doped with a phosphorescent material (FIrpic) showed efficient sky-blue electroluminescence with a maximum external quantum efficiency of 9.33%.

    DOI： 10.1080/15421406.2019.1648040

  • Supramolecular Gel Phase Controlled [4 + 2] Diels-Alder Photocycloaddition for Electroplex Mediated White Electroluminescence Reviewed International coauthorship

    Satyajit Das, Naoki Okamura, Shigeyuki Yagi, Ayyappanpillai Ajayaghosh

    Journal of the American Chemical Society   141 ( 14 )   5635 - 5639   2019.04（ ISSN:0002-7863 ）

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    Copyright © 2019 American Chemical Society. Diels-Alder photocycloaddition of 9-phenylethynylanthracene results in multiple [4 + 2] and [4 + 4] cycloaddition products in solution, which can be controlled to form specific products under a restricted environment. We have exploited the gel phase of a 9-phenylethynylanthracence derivative as a confined medium to specifically yield the [4 + 2] cycloadduct in >90% yield. The photocycloadduct (anti-form) exhibited a blue emission with CIE chromaticity of x = 0.16/y = 0.16. Construction of an organic light emitting device with the photocycloadduct, using a carbazole-based hole transporting host, resulted in white light emission with a CIE chromaticity of x = 0.33/y = 0.32. This observation not only highlights the use of gel chemistry to achieve the otherwise difficult to obtain photoproducts but also underlines their potential in optoelectronic device fabrication.

    DOI： 10.1021/jacs.9b00955

    PubMed

  • Functionalization of Organometallic Complexes Aimed at Solution-Processed Organic Light-Emitting Diode: Strategic Molecular Designs of Phosphorescent Dendritic Emitters

    Shigeyuki Yagi, Naoki Okamura, and Takeshi Maeda

    J. Syn. Org. Chem., Jpn.   77 ( 1 )   26 - 39   2019.01

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  • Intramolecular Exciton-Coupled Squaraine Dyes for Dye-Sensitized Solar Cells Reviewed

    Takeshi Maeda, Tay Van Nguyen, Yuki Kuwano, Xixi Chen, Kyohei Miyanaga, Hiroyuki Nakazumi, Shigeyuki Yagi, Suraj Soman, and Ayyappanpillai Ajayaghosh

    J. Phys. Chem. C 雑誌 アメリカ化学会   122 ( 38 )   21745 - 21754   2018.09

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  • Janus-Type Dendritic Organoiridium(III) Complex Bearing Hole- and Electron-Transporting Moieties: Synthesis, Luminescence Properties, and OLED Applications Reviewed

    Naoki Okamura, Takeshi Maeda, and Shigeyuki Yagi

    Bull. Chem. Soc. Jpn. 雑誌 日本化学会   91 ( 9 )   1419 - 1428   2018.09

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  • Synthesis and Properties of Functional Dyes with Squaraine–Naphthalene Diimide Hybrid Structure

    Takeshi Maeda, Jin Zhou, Yuya Oda, Hiroyuki Nakazumi, Shigeyuki Yagi

    Res. Chem. Int. 雑誌 Springer   44 ( 8 )   4783 - 4795   2018.08

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  • Control of Excimer Phosphorescence by Steric Effects in Cyclometalated Platinum(II) Diketonate Complexes Bearing Peripheral Carbazole Moieties towards Application in Non-doped White OLED Reviewed

    Naoki Okamura, Kazuaki Egawa, Takeshi Maeda, and Shigeyuki Yagi

    New. J. Chem. 雑誌 英国王立化学会   42 ( 14 )   11583 - 11592   2018.07

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  • Photokinetic Study on Remarkable Excimer Phosphorescence from Cyclometalated Platinum(II) Complexes Bearing a Benzoylated 2-Phenylpyridinate Ligand Reviewed

    Naoki Okamura, Takeshi Maeda, Hideki Fujiwara, Anjaly Soman, K. N. Narayanan Unni, Ayyappanpillai Ajayaghosh, and Shigeyuki Yagi

    Phys. Chem. Chem. Phys. 雑誌 イギリス王立化学会   20 ( 1 )   2018.01

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  • Luminescent Properties of Novel Bis-Cyclometalated Iridium(III) Complexes Bearing Methoxy-Substituted Dibenzoylmethanate Ligands

    Naoki Okamura, Miho Miyazaki, Shigeru Ikawa, Takeshi Maeda, Hiroyuki Nakazumi, and Shigeyuki Yagi

    Mol. Cryst. Liq. Cryst. 雑誌 Taylor & Francis   653 ( 1 )   131 - 136   2017.11

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  • Sky-Blue Phosphorescence from Bis- and Tris-cyclometalated Iridium(III) Complexes Bearing Carbazole-based Dendrons: Fabrication of Non-doped Multilayer Organic Light-Emitting Diodes by Solution Processing Reviewed

    Naoki Okamura, Takeshi Maeda, and Shigeyuki Yagi

    New J. Chem. 雑誌 英国王立化学会   41 ( 18 )   10357 - 10366   2017.09

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  • Luminescent Properties of Novel Bis-cyclometalated Iridium(III) Complex Bearing a Phosphine Oxide-appended Diketonate Ligand for Solution-processed Multilayer OLEDs Reviewed

    Naoki Okamura, Kazuya Ishiguro, Takeshi Maeda, and Shigeyuki Yagi

    Chem. Lett. 雑誌 日本化学会   46 ( 8 )   1095 - 1098   2017.08

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  • Synthesis and Luminescence Properties of Dithieno[3,2-a:2',3'-c]phenazine Derivatives with Electron-donating pi-Conjugated Side-arms at the 2, 5- and 8, 11-Positions Reviewed

    Yanjun He, Natsuki Okamoto, Takeshi Maeda, Hiroyuki Nakazumi, and Shigeyuki Yagi

    J. Jpn. Soc. Colour Mater. 雑誌 一般社団法人色材協会   90 ( 2 )   51 - 60   2017.02

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  • Synthesis and Luminescence Properties of Dibenzo[a,c]phenazine Derivatives Bearing a Series of Electron-donating pi-Conjugated Side-arms at the 10,13-Positions. Novel ICT-type Red Fluorophores based on Donor-acceptor-donor Structures Reviewed

    Yanjun He, Yuichiro Hayashi, Takeshi Maeda, Hiroyuki Nakazumi, and Shigeyuki Yagi

    J. Jpn. Soc. Colour Mater. 雑誌 一般社団法人色材協会   89 ( 11 )   371 - 379   2016.11

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  • Spin-Orbit Coupling Analyses of the Phosphorescence: The Effects of Cyclometalated Ligand Replacement in fac-Ir(ppy)3 with Various bpy Ligands to Blue Phosphorescence Reviewed

    Harunobu Yoshinaga, Toshio Asada, Shiro Koseki, Shigeyuki Yagi, and Takeshi Matsushita

    RSC Adv. 雑誌 英国王立化学会   6 ( 69 )   65020 - 65030   2016.07

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  • Novel Bis- and Tris-cyclometalated Iridium(III) Complexes Bearing a Benzoyl Group on Each Fluorinated 2-Phenylpyridinate Ligand Aimed at Development of Blue Phosphorescent Materials for OLED Reviewed

    Naoki Okamura, Taiyo Nakamura, Shigeyuki Yagi, Takeshi Maeda, Hiroyuki Nakazumi, Hideki Fujiwara, and Shiro Koseki

    RSC Adv. 雑誌 英国王立化学会   6 ( 56 )   51435 - 51445   2016.06

  • Linear and Tripodal Squaraine Sensitizers with Triphenylamine Donor Components for Dye-sensitized Solar Cells Reviewed

    Tay Van Nguyen, Takeshi Maeda, Hiroyuki Nakazumi, Shigeyuki Yagi

    Chem. Lett. 雑誌 日本化学会   45 ( 3 )   291 - 293   2016.03

  • Substituent Effect on Photo- and Electroluminescence Properties of Heteroleptic Cyclometalated Platinum(II) Complexes Based on a 2(Dibenzo[b,d]furan-4-yl)pyridine Ligand

    Tatsuya Shigehiro, Qiang. Chen, Shigeyuki Yagi, Takeshi Maeda, Hiroyuki Nakazumi, and Yoshiaki Sakurai

    Dyes Pigm. 雑誌 Elsevier   124   165 - 173   2016.01

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  • Synthesis and Luminescent Properties of Novel Dibenzo[a,c]phenazine Derivatives with Electron-Donating Side-Arms Reviewed

    Yanjun He, Shigeyuki Yagi, Takeshi Maeda, and Hiroyuki Nakazumi

    Mol. Cryst. Liq. Cryst. 雑誌 Taylor & Francis   621   64 - 69   2015.12

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  • Starburst-Type Carbazole Trimers as Host Materials for Solution-Processed Phosphorescent OLEDs

    Naoki Okamura, Hiroshi Funagoshi, Shigeru Ikawa, Shigeyuki Yagi, Takeshi Maeda, and Hiroyuki Nakazumi

    Mol. Cryst. Liq. Cryst. 雑誌 Taylor & Francis   621   59 - 63   2015.12

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  • Photo- and Electroluminescence from Organoplatinum(II) Complexes Bearing Oligofluorene-Based Cyclometalated Ligands Reviewed

    Shigeyuki Yagi, Tatsuya Shigehiro, Tomonari Takata, Takeshi Maeda, and Hiroyuki Nakazumi

    Mol. Cryst. Liq. Cryst. 雑誌 Taylor & Francis   621   53 - 58   2015.12

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  • Near-infrared Squaraine Sensitizers Bearing Benzo[c,d]indolenine as an Acceptor Moiety Reviewed

    Takeshi Maeda, Shohei, Nitta, Yohei Sano, Shota Tanaka, Shigeyuki Yagi, and Hiroyuki Nakazumi

    Dyes Pigm. 雑誌 Elsevier   122   160 - 167   2015.11

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  • Squaraine Dyes with BODIPY Skeletons for the Application to Dye-Sensitized Solar Cells Reviewed

    Takeshi Maeda, Daisuke Kakio, Shigeyuki Yagi, Hiroyuki Nakazumi

    J. Jpn. Soc. Colour Mater.   88 ( 7 )   208 - 217   2015.07

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    Kind of work：Joint Work  

  • Novel Phosphorescent Platinum(II) Dipyrido[3,2-a:2’,3’-c]phenazine Bis(acetylide) Complexes Bearing Electron-donating Components at the 2,7-Positions Reviewed

    Tatsuya Shigehiro, Yasuhiro Kawai, Shigeyuki Yagi, Takeshi Maeda, Hiroyuki Nakazumi, Yoshiaki Sakurai

    Chem. Lett. 雑誌   44 ( 3 )   288 - 290   2015.03

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    Kind of work：Joint Work  

  • White Polymer Light-emitting Diodes Co-doped with Three Phosphorescent Iridium(III) Complexes Aimed at Improvement of Color Rendering Properties Reviewed

    Shigeru Ikawa, Shigeyuki Yagi, Takeshi Maeda, Hiroyuki Nakazumi, Yoshiaki Sakurai

    J. Lumin. 雑誌 Elsevier   155   368 - 373   2014.11

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    Kind of work：Joint Work  

  • Novel 10,13-Disubstituted Dipyrido[3,2-a:2’,3’-c]phenazines and Their Platinum(II) Complexes. Highly Luminescent ICT-type Fluorophores Based on D-A-D Structures Reviewed

    Tatsuya Shigehiro, Shigeyuki Yagi, Takeshi Maeda, Hiroyuki Nakazumi, Hideki Fujiwara, Yoshiaki Sakurai

    Tetrahedron Lett. 雑誌   55 ( 37 )   5195 - 5198   2014.09

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    Kind of work：Joint Work  

  • Photo- and Electroluminescence from Deep-red- and Near-infrared-phosphorescent Tris-cyclometalated Iridium(III) Complexes Bearing Largely pi-Extended Ligands Reviewed

    Shigeru Ikawa, Shigeyuki Yagi, Takeshi Maeda, Hiroyuki Nakazumi, Hideki Fujiwara, Shiro Koseki, Yoshiaki Sakurai

    Inorg. Chem. Commun. 雑誌 Elsevier   38 ( 1 )   14 - 19   2013.12

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    Kind of work：Joint Work  

  • Photo- and Electroluminescence from 2-(dibenzo[b,d]furan-4-yl)pyridine-based Heteroleptic Cyclometalated Platinum(II) Complexes: Excimer Formation Drastically Facilitated by an Aromatic Diketonate Ancillary Ligand Reviewed

    Tatsuya Shigehiro, Shigeyuki Yagi, Takeshi Maeda, Hiroyuki Nakazumi, Hideki Fujiwara, and Yoshiaki Sakurai

    The Journal of Physical Chemistry C 雑誌 米国化学会   117 ( 1 )   532 - 542   2013.01

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    Kind of work：Joint Work  

  • Synthesis and Near-infrared Absorption Properties of Linearly pi-Extended Squarylium Oligomers Reviewed

    Shigeyuki Yagi, Yuuki Nakasaku, Takeshi Maeda, Hiroyuki Nakazumi, Yoshiaki Sakurai

    Dyes Pigm. 雑誌 Elsevier   90 ( 2 )   211 - 218   2011.08

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    Kind of work：Joint Work  

  • Pure Red Electrophosphorescence from Polymer Light-emitting Diodes Doped with Highly Emissive Bis-cyclometalated Iridium(III) Complexes Reviewed

    Hidetaka Tsujimoto, Shigeyuki Yagi, Hotaka Asuka, Yuji Inui,　Shigeru Ikawa, Takeshi Maeda, Hiroyuki Nakazumi, and Yoshiaki Sakurai

    J. Organomet. Chem. Elsevier   695 ( 17 )   1972 - 1978   2010.08

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    Kind of work：Joint Work  

  • White Electroluminescence Obtained from a Polymer Light-emitting Diode Containing Two Phosphorescent Iridium(III) Complexes in an Emitting Layer Reviewed

    Hidetaka Tsujimoto, Shigeyuki Yagi, Shigeru Ikawa, Hotaka Asuka, Takeshi Maeda, Hiroyuki Nakazumi, and Yoshiaki Sakurai

    J. Jpn. Soc. Colour Mater. 雑誌 The Japan Society of Colour Material   83 ( 5 )   207 - 214   2010.05

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Books and Other Publications

  • Chiral Luminescence: From Molecules to Materials and Devices

    Shigeyuki Yagi, Yoshitane Imai（ Role： Contributor ,  Chapter 19: Phosphorescent Organometallic Complexes Aimed at Fabrication of Electroluminescent Devices）

    Wiley-VCH  2024.03  （ ISBN:3527351809 ）

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    Total pages：992  

    ASIN

  • Progress in the Science of Functional Dyes (Chapter 16: Luminescent Materials for Organic Light-Emitting Diodes)

    Shigeyuki Yagi（ Role： Contributor ,  Luminescent Materials for Organic Light-Emitting Diodes）

    Springer  2021.04  （ ISBN:9813343915 ）

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    Total pages：609  

    ASIN

  • Progress in the Science of Functional Dyes (Co-editor)

    （ Role： Joint editor）

    2021.04  （ ISBN:9813343915 ）

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    Total pages：609  

    ASIN

  • CSJ Current Review 40 Functional Color Materials Towards The Future

    （ Role： Joint author）

    2021.03  （ ISBN:978-4-7598-1400-2 ）

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    Responsible for pages：pp. 2-13  

  • 有機EL用発光材料の開発

    八木繁幸

    シーエムシー出版  2016.10  （ ISBN:978-4-7813-1189-0 ）

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    Responsible for pages：119-140  

  • 有機エレクトロニクスを指向した有機金属元素ブロック材料の創出

    八木繁幸

    シーエムシー出版  2016.06  （ ISBN:978-4-7813-1160-9 ）

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    Responsible for pages：33-42  

  • 有機デバイスのための塗布技術

    八木　繁幸、中澄　博行（ Role： Joint author）

    シーエムシー出版  2012.03 

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    Responsible for pages：202－212  

  • 化学工業

    八木繁幸、中澄博行（ Role： Joint author）

    化学工業社  2010.07 

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    Responsible for pages：553-559  

  • Topics in Heterocyclic Chemistry 14. Heterocyclic Polymethine Dyes, Squarylium Dyes and Related Compounds

    Shigeyuki Yagi, Hiroyuki Nakazumi（ Role： Joint author）

    Springer-Verlag  2008.05 

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    Responsible for pages：133-181  

  • ファインケミカルシリーズ　機能性色素の合成と応用技術　第1編第8章　スクアリリウム系色素

    八木繁幸, 中澄博行（ Role： Joint author）

    シーエムシー出版  2007.10 

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    Responsible for pages：107-128  

  • Functional Dyes, Chapter 6. Syntheses and application of squarylium dyes

    Shigeyuki Yagi, Hiroyuki Nakazumi（ Role： Joint author）

    Elsevier  2006.04 

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    Responsible for pages：215-255  

  • エレクトロニクス材料・技術シリーズ　有機薄膜太陽電池の最新技術

    八木繁幸，中澄博行（ Role： Joint author）

    シーエムシー出版  2005.11 

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    Responsible for pages：121-126  

  • Synthesis and Photochromic Properties of Benzothiopyranoid and Benzopyranoid Dyes

    H. Nakazumi, S. Yagi, K. Maeda（ Role： Joint author）

    Mita Press  1993.12 

  • Molecular Structures of Spirobenzothiopyranobenzopyrylium Dyes

    H. Nakazumi, S. Yagi, K. Maeda（ Role： Joint author）

    Mita Press  1993.12 

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MISC

  • Magnetic circularly polarized luminescence (MCPL) from optically inactive platinum complex

    鈴木聖香, 山本優太, 原健吾, 北原真穂, 八木繁幸, 今井喜胤

    基礎有機化学討論会要旨集   33rd (CD-ROM)   2023

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  • Circularly polarized luminescence (CPL) and magnetic Circularly polarized luminescence (MCPL) from optically active iridium luminescent material

    長谷川公紀, 原健吾, 長谷川真士, 八木繁幸, 今井喜胤

    日本化学会春季年会講演予稿集(Web)   103rd   2023

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  • Development of magnetic circularly polarized organic light emitting diode (MCP-OLED) composed of iridium complexes

    岩崎寛, 原健吾, 北原真穂, 八木繁幸, 今井喜胤

    日本化学会春季年会講演予稿集(Web)   103rd   2023

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  • Near-infrared optical properties of luminescent lanthanide complexes

    田島功樹, 志倉瑠太, 中井英隆, 鈴木仁子, 八木繁幸, 今井喜胤

    日本化学会春季年会講演予稿集(Web)   103rd   2023

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  • Development of magnetic circularly polarized organic light emitting diode (MCP-OLED) composed of single achiral platinum complex

    今井喜胤, 山本優太, 原健吾, 北原真穂, 八木繁幸

    日本化学会春季年会講演予稿集(Web)   103rd   2023

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  • Full-color magnetic circularly polarized organic light-emitting diodes (MCP-OLED) composed of iridium complexes

    北原真穂, 志倉瑠太, 紙本麻央, 八木繁幸, 今井喜胤

    基礎有機化学討論会要旨集   32nd (CD-ROM)   2022

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  • Near-infrared optical properties in luminescent lanthanoid complexes

    田島功樹, 志倉瑠太, 八木繁幸, 鈴木仁子, 中井英隆, 今井喜胤

    基礎有機化学討論会要旨集   32nd (CD-ROM)   2022

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  • Creation and Higher Performance of Magnetic Circularly Polarized Organic Light Emitting Diode (MCP-OLED)

    原健吾, 八木繁幸, 今井喜胤

    有機典型元素化学討論会講演要旨集   49th (CD-ROM)   2022

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  • エキシマー発光性白金錯体の創出と有機EL 素子への応用

    八木　繁幸

    日本化学会コロイドおよび界面化学部会 C & I Commun   46 ( 4 )   25 - 27   2021.12

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  • デンドリマー型りん光性有機金属錯体の開発と塗布型有機電界発光素子への応用

    八木　繁幸

    シーエムシー出版 ファインケミカル   50 ( 9 )   18 - 24   2021.09

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  • Development of Phosphorescent Organometallic Dendrimers and Their Application to Solution-Processed Organic Light-Emitting Diodes Invited

    Shigeyuki Yagi

    50 ( 9 )   18 - 24   2021.09

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    Authorship：Lead author,　Corresponding author   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

  • Preface

    Yousuke Ooyama, Shigeyuki Yagi

    Progress in the Science of Functional Dyes   v - vi   2021.01（ ISBN:9789813343924 ）

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Presentations

  • フタロシアニン・ポルフィリン発光体からの円偏光電界発光(CPEL)

    鈴木 聖香, 山本 優太, 志倉 瑠太, 鈴木 仁子, 八木 繁幸, 今井 喜胤

    日本化学会第104春季年会  2024.03 

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    Presentation type：Poster presentation  

  • 架橋ビチオフェンをπスペーサーとする新規D‒π‒A 型分子の合成と物性

    上田 未侑, 永山 諒, 鈴木 直弥, 小玉 晋太朗, 前田 壮志, 八木 繁幸

    日本化学会第104春季年会  2024.03 

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    Presentation type：Poster presentation  

  • ベンゼン縮環インドレニンからなるC2v 対称スクアレン色素の結晶性薄膜の作製と近赤外光検出器への展開

    濱 玲史, 前田 壮志, 鈴木 直弥, 八木 繁幸, 藤原 秀紀

    日本化学会第104春季年会  2024.03 

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    Presentation type：Oral presentation (general)  

  • チオフラビリウム骨格からなる中間開殻性クロコナイン色素の相転移が磁気特性に及ぼす効果

    小野 皓平, 岡 大志, 前田 壮志, 酒巻 大輔, 藤原 秀紀, 鈴木 直弥, 小玉 晋太朗, 八木 繁幸

    日本化学会第104春季年会  2024.03 

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    Presentation type：Oral presentation (general)  

  • 2-フェニルキノキサリンを配位子とするイリジウム(III)錯体の近赤外りん光に及ぼすメトキシ置換基の影響

    米田 啓馬, 志倉 瑠太, 鈴木 直弥, 小玉 晋太朗, 前田 壮志, 八木 繁幸, 藤原 秀紀, 秋山 誠治

    日本化学会第104春季年会  2024.03 

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    Presentation type：Oral presentation (general)  

  • Generation of Circularly Polarized Electroluminescence from Organic Light-Emitting Diodes with Optically Inactive Phosphorescent Emitters under an External Magnetic Field Invited International conference

    Shigeyuki Yagi

    Pure and Applied Chemistry International Conference 2024 (PACCON 2024)  2024.01 

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    Presentation type：Oral presentation (invited, special)  

  • Development of Near-infrared Phosphorescent Organoiridium(III) Complexes Bearing 2-Arylquinoxaline-based Cyclometalated Ligands International conference

    Ryuta Shikura, Keima Yoneda, Naoya Suzuki, Shintaro Kodama, Takeshi Maeda, Shigeyuki Yagi, Seiji Akiyama

    Pure and Applied Chemistry International Conference 2024 (PACCON 2024)  2024.01 

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    Presentation type：Oral presentation (general)  

  • Development of Phosphorescent Bis-cyclometalated iridium(III) Complexes towards Near-infrared Electroluminescent Devices International conference

    Ryuta Shikura, Keima Yoneda, Naoya Suzuki, Shintaro Kodama, Takeshi Maeda, Shigeyuki Yagi, Seiji Akiyama

    Satellite Symposium for Graduate Students on the Topic of Advanced Photochemistry at Pure and Applied Chemistry Conference 2024  2024.01 

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    Presentation type：Oral presentation (general)  

  • Magnetic field driven circularly polarized luminescence from phosphorescent organometallic complexes and their electroluminescent devices Invited International conference

    Shigeyuki Yagi

    International Conference on Advances in Interdisciplinary Nanosicence 2024 (ICAINS-24)  2024.01 

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    Presentation type：Oral presentation (keynote)  

    Venue：Thiruvananthapuram, Kerala, India  

  • Magnetic Circularly Polarized Electroluminescence from Phosphorescent Organic Light-Emitting Diodes Invited International conference

    Shigeyuki Yagi

    International Symposium on Circularly Polarized Luminescence and the Related Phenomena 2023 (ISCPL 2023)  2023.11 

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    Presentation type：Oral presentation (invited, special)  

  • Magnetically Driven Circularly Polarized Electroluminescence Devices Based on Phosphorescent Organometallic Complexes Invited International conference

    Shigeyuki Yagi

    Joint France−Japan Symposium on Circularly Polarized Luminescence and the Related Phenomena  2023.11 

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    Presentation type：Oral presentation (invited, special)  

  • 種々の複素環からなる近赤外吸収クロコナイン色素の中間開殻性

    前田 壮志, 岡 大志, 大野 友彰, 酒巻 大輔, 藤原 秀紀, 鈴木 直弥, 八木 繁幸

    2023年度色材研究発表会  2023.11 

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    Presentation type：Oral presentation (general)  

  • フェナジンおよびピラジノ[2,3-b]キノキサリンを電子アクセプターとするドナー–アクセプター型近赤外蛍光色素の創出

    長岡 昌希, 鈴木 直弥, 小玉 晋太朗, 前田 壮志, 酒巻 大輔, 藤原 秀紀, 大峰 拓也, 佐伯 昭紀, 八木 繁幸

    2023年度色材研究発表会  2023.11 

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    Presentation type：Oral presentation (general)  

  • カルボニル架橋ビチオフェンをπスペーサーとする新規D‒π‒A型分子の合成と光学・発光特性

    上田 未侑, 永山 諒, 鈴木 直弥, 小玉 晋太郎, 前田 壮志, 八木 繁幸

    2023年度色材研究発表会  2023.11 

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    Presentation type：Oral presentation (general)  

  • 共役ダイトピック配位子を用いた強発光有機白金(II)二核錯体の創出

    志倉 瑠太, 工藤 虹輝, 鈴木 直弥, 小玉 晋太朗, 前田 壮志, 八木 繁幸

    2023年度色材研究発表会  2023.11 

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    Presentation type：Poster presentation  

  • カルバゾールを基盤とする溶液塗布型OLED用ホストポリマー材料の創出

    手島 僚也, 鈴木 直弥, 小玉 晋太朗, 前田 壮志, 八木 繁幸, 北山 雄己哉, 原田 敦史

    2023年度色材研究発表会  2023.11 

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    Presentation type：Poster presentation  

  • Impacts of Methyl Substituents on Luminescence Properties of NIR Phosphorescent Iridium(III) Complexes With 2-Phenylquinoxaline-Based Cyclometalated Ligands

    Keima Yoneda, Ryuta Shikura, Naoya Suzuki, Shintaro Kodama, Takeshi Maeda, Shigeyuki Yagi, Hideki Fujiwara, Seiji Akiyama

    Faraday Discussions: Challenges and Prospects in Organic Photonics and Electronics  2023.11 

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    Presentation type：Poster presentation  

  • Phosphorescent Organometallic Complexes for Visible and Near Infrared Electroluminescence Devices Invited

    Shigeyuki Yagi

    11th East Asia Symposium on Functional Dyes and Advanced Materials (EAS11)  2023.10 

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    Presentation type：Symposium, workshop panel (nominated)  

  • Synthesis and Properties of Intramolecular Hydrogen-Bonded Squaraine Dyes and Their Application to Near-Infrared Photodetectors International conference

    Reiji Hama, Takeshi Maeda, Naoya Suzuki, Shintaro Kodama, Shigeyuki Yagi

    11th East Asia Symposium on Functional Dyes and Advanced Materials (EAS11)  2023.10 

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    Presentation type：Poster presentation  

    Venue：Taipei, Taiwan  

  • Optical and Electrochemical Properties of C2v-Symmetric Bissquaraine Dyes Fused on Benzodipyrrole Central Units International conference

    Ryuhei Sawada, Saki Kinoshita, Naoya Suzuki, Shintaro Kodama, Takeshi Maeda, Shigeyuki Yagi

    11th East Asia Symposium on Functional Dyes and Advanced Materials (EAS11)  2023.10 

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    Presentation type：Poster presentation  

    Venue：Taipei, Taiwan  

  • Effects of Intermediate Diradical Character on cis-trans Isomerization of Near-Infrared Absorbing Squaraine Dyes International conference

    Taishi Oka, Takeshi Maeda, Naoya Suzuki, Shintaro Kodama, Daisuke Sakamaki, Hideki Fujiwara, Shigeyuki Yagi

    11th East Asia Symposium on Functional Dyes and Advanced Materials (EAS11)  2023.10 

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    Presentation type：Poster presentation  

    Venue：Taipei, Taiwan  

  • Development of Intramolecular Charge Transfer-Type Near-Infrared Fluorescent Dyes Bearing Phenazine- and Pyrazino[2,3-b]quinoxaline-Based Electron Acceptors International conference

    Masaki Nagaoka, Naoya Suzuki, Shintaro Kodama, Takeshi Maeda, Daisuke Sakamaki, Hideki Fujiwara, Takuya Oomine, Akinori Saeki, and Shigeyuki Yagi

    11th East Asia Symposium on Functional Dyes and Advanced Materials (EAS11)  2023.10 

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    Presentation type：Poster presentation  

    Venue：Taipei, Taiwan  

  • Impacts of Methyl Substituents on Luminescence Properties of Near Infrared Phosphorescent Iridium(III) Complexes Bearing 2-Phenylquinoxaline-Based Cyclometalated Ligands International conference

    Keima Yoneda, Ryuta Shikura, Naoya Suzuki, Shintaro Kodama, Takeshi Maeda, Shigeyuki Yagi, Hideki Fujiwara, Seiji Akiyama

    11th East Asia Symposium on Functional Dyes and Advanced Materials (EAS11)  2023.10 

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    Presentation type：Poster presentation  

    Venue：Taipei, Taiwan  

  • 含窒素ヘテロアセンを基盤とするドナー–アクセプター型近赤外蛍光色素の合成と発光特性 Domestic conference

    長岡昌希，鈴木直弥，児玉晋太郎，前田壮志，酒巻大輔，藤原秀紀，大峰拓也，佐伯昭紀，八木繁幸

    第33回基礎有機化学討論会  2023.09  基礎有機化学会

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    Presentation type：Poster presentation  

    Venue：岡山県岡山市  

  • 分子内水素結合を有するC2v対称スクアレン色素の合成と光学特性 Domestic conference

    濵 玲史，前田壮志，鈴木直弥，小玉晋太朗，八木繁幸

    第33回基礎有機化学討論会  2023.09  基礎有機化学会

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    Presentation type：Poster presentation  

    Venue：岡山県岡山市  

  • 近赤外吸収スクアレン色素の中間ジラジカル性がシス－トランス異性化に及ぼす影響 Domestic conference

    岡 大志，前田壮志，鈴木直弥，小玉晋太朗，酒巻大輔，藤原秀紀，八木繁幸

    第33回基礎有機化学討論会  2023.09  基礎有機化学会

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    Presentation type：Oral presentation (general)  

    Venue：岡山県岡山市  

  • 光学不活性白金錯体からの磁気円偏光発光(MCPL) Domestic conference

    鈴木聖香，山本優太，原 健吾，北原真穂，八木繁幸，今井喜胤

    第33回基礎有機化学討論会  2023.09  基礎有機化学会

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    Presentation type：Poster presentation  

    Venue：岡山県岡山市  

  • 2-フェニルキノキサリン系配位子を有する近赤外りん光イリジウム(III)錯体の発光特性に及ぼすメチル置換基の影響

    米田啓馬, 志倉瑠太, 鈴木直弥, 小玉晋太朗, 前田壮志, 八木繁幸, 藤原秀紀, 秋山誠治

    第33回基礎有機化学討論会  2023.09 

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    Presentation type：Poster presentation  

  • 機能性色素の高機能化に向けた新規分子骨格の探索 Invited Domestic conference

    八木 繁幸

    高分子学会 高分子同友会 勉強会  2023.09  高分子学会

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    Presentation type：Public lecture, seminar, tutorial, course, or other speech  

    Venue：オンライン  

  • Intermediate Open-Shell Character of Near-Infrared Absorbing Oxocarbon Derivatives

    Takeshi Maeda, Taishi Oka, Tomoaki Ohno, Daisuke Sakamaki, Hideki Fujiwara, Naoya Suzuki, Shigeyuki Yagi, Tatsuki Konishi, Kenji Kamada

    15th International Symposium on Functional π-Electron Systems (Fπ-15)  2023.06 

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    Presentation type：Oral presentation (general)  

  • 近赤外吸収クロコナイン色素の複素環成分が中間開殻性に及ぼす効果 Domestic conference

    大野 友彰，岡 大志，前田 壮志，酒巻 大輔，鈴木 直弥，八木 繁幸，藤原 秀紀

    日本化学会第103春季年会  2023.03  日本化学会

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    Presentation type：Poster presentation  

    Venue：東京理科大学野田キャンパス（千葉県野田市）  

  • π拡張したピリジニウム–環状エノラートベタイン色素の近赤外光吸収特性 Domestic conference

    藤本 極，鈴木 直弥，前田 壮志，八木 繁幸

    日本化学会第103春季年会  2023.03  日本化学会

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    Presentation type：Oral presentation (general)  

    Venue：東京理科大学野田キャンパス（千葉県野田市）  

  • フェニル置換カルコゲノピリリウム骨格からなるクロコナイン色素の中間開殻性評価 Domestic conference

    岡 大志，前田 壮志，酒巻 大輔，鈴木 直弥，八木 繁幸，藤原 秀紀

    日本化学会第103春季年会  2023.03  日本化学会

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    Presentation type：Poster presentation  

    Venue：東京理科大学野田キャンパス（千葉県野田市）  

  • 長鎖アルキル基を付与したシクロメタル化白金(II)錯体の合成と発光特性 Domestic conference

    豊田 崇太，紙本 麻央，鈴木 直弥，前田 壮志，八木 繁幸

    日本化学会第103春季年会  2023.03  日本化学会

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    Presentation type：Oral presentation (general)  

    Venue：東京理科大学野田キャンパス（千葉県野田市）  

  • 光学活性イリジウム発光体からの円偏光発光(CPL)および磁気円偏光発光(MCPL) Domestic conference

    長谷川 公紀，原 健吾，長谷川 真士，八木 繁幸，今井 喜胤

    日本化学会第103春季年会  2023.03  日本化学会

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    Presentation type：Oral presentation (general)  

    Venue：東京理科大学野田キャンパス（千葉県野田市）  

  • 結晶化誘起二重発光特性を示す新規インドリノン誘導体 Domestic conference

    八木 啓太，鈴木 直弥，酒巻 大輔，前田 壮志，藤原 秀紀，八木 繁幸

    日本化学会第103春季年会  2023.03  日本化学会

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    Presentation type：Oral presentation (general)  

    Venue：東京理科大学野田キャンパス（千葉県野田市）  

  • 含窒素ヘテロアセン骨格を電子アクセプターとする新規分子内電荷移動型 π 共役化合物の創出と短波赤外発光特性 Domestic conference

    長岡 昌希，鈴木 直弥，前田 壮志，酒巻 大輔，藤原 秀紀，大峰 拓也，佐伯 昭紀，八木 繁幸

    日本化学会第103春季年会  2023.03  日本化学会

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    Presentation type：Oral presentation (general)  

    Venue：東京理科大学野田キャンパス（千葉県野田市）  

  • 赤色りん光性ビスシクロメタル化イリジウム(III)錯体の発光特性に及ぼす補助配位子の効果 Domestic conference

    紙本 麻央，岩野 紘大，辻元 英孝，鈴木 直弥，前田 壮志，八木 繁幸

    日本化学会第103春季年会  2023.03  日本化学会

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    Presentation type：Oral presentation (general)  

    Venue：東京理科大学野田キャンパス（千葉県野田市）  

  • ジベンゾ[b,d]フラン骨格を基盤とする新規白金二核錯体の合成と発光特性 Domestic conference

    工藤 虹輝，桜井 彩乃，辻元 英孝，鈴木 直弥，前田 壮志，八木 繫幸

    日本化学会第103春季年会  2023.03  日本化学会

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    Presentation type：Oral presentation (general)  

    Venue：東京理科大学野田キャンパス（千葉県野田市）  

  • 白金錯体による磁気円偏光有機発光ダイオード(MCP-OLED)の開発 Domestic conference

    今井 喜胤，山本 優太，原 健吾，北原 真穂，八木 繁幸

    日本化学会第103春季年会  2023.03  日本化学会

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    Presentation type：Poster presentation  

    Venue：東京理科大学野田キャンパス（千葉県野田市）  

  • 発光性ランタノイド錯体における近赤外光学特性 Domestic conference

    田島 功樹，志倉 瑠太，中井 英隆，鈴木 仁子，八木 繁幸，今井 喜胤

    日本化学会第103春季年会  2023.03  日本化学会

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    Presentation type：Poster presentation  

    Venue：東京理科大学野田キャンパス（千葉県野田市）  

  • 有機イリジウム錯体による磁気円偏光有機発光ダイオード(MCP-OLED)の開発 Domestic conference

    岩﨑 寛，原 健吾，北原 真穂，八木 繁幸，今井 喜胤

    日本化学会第103春季年会  2023.03  日本化学会

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    Presentation type：Poster presentation  

    Venue：東京理科大学野田キャンパス（千葉県野田市）  

  • 2-フェニルキノキサリン系ビスシクロメタル化イリジウム(III)錯体の発光特性に及ぼす置換基の影響

    米田 啓馬, 志倉 瑠太, 鈴木 直弥, 前田 壮志, 八木 繁幸, 秋山 誠治

    日本化学会第103春季年会  2023.03 

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  • Photoluminescence Properties of Near-infrared Phosphorescent Bis-cyclometalated Iridium(III) Complexes Bearing Novel π-Deficient Heteroaromatic-based Ligands International conference

    Keima Yoneda, Ryuta Shikura, Naoya Suzuki, Takeshi Maeda, Shigeyuki Yagi

    International CPL and CPEL Conference 2023  2023.03 

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    Presentation type：Oral presentation (general)  

    Venue：Osaka  

  • Effects of Ancillary Ligands on Luminescence Properties of Red Phosphorescent Bis-Cyclometalated Iridium(III) Complexes

    Mao Kamimoto, Hiroto Iwano, Hidetaka Tsujimoto, Naoya Suzuki, Takeshi Maeda, Shigeyuki Yagi

    International CPL and CPEL Conference 2023  2023.03 

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  • Development of Magnetic Circularly Polarized Organic Light Emitting Diode (MCP-OLED) Composed of Single Achiral Platinum Complex

    Yuta Yamamoto, Kengo Hara, Maho Kitahara, Shigeyuki Yagi, Yoshitane Imai

    International CPL and CPEL Conference 2023  2023.03 

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  • Development of a Dibenzo[b,d]furan-Based Dinuclear Platinum(II) Complex Showing Intense Room-Temperature Phosphorescence

    Koki Kudo, Ayano Sakurai, Hidetaka Tsujimoto, Naoya Suzuki, Takeshi Maeda, Shigeyuki Yagi

    International CPL and CPEL Conference 2023  2023.03 

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  • Fabrication of Solution-Processed Organic Light-Emitting Diodes Using Phosphorescent Emitters International conference

    Shigeyuki Yagi

    International CPL and CPEL Conference 2023  2023.03 

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    Presentation type：Poster presentation  

    Venue：Osaka  

  • Development of Novel Near-Infrared Phosphorescent Iridium(III) Complexes Bearing 2-Arylquinoxaline Cyclometalated Ligands

    Ryuta Shikura, Takeshi Maeda, Naoya Suzuki, Shigeyuki Yagi, Fujiwara Hideki

    International CPL and CPEL Conference 2023  2023.03 

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  • Development of A–D–A Deep Red/Near infrared Emitting Dyes Based on Dithienosilole Dimers

    Ryoya Teshima, Takeshi Maeda, Naoya Suzuki, Shigeyuki Yagi

    International CPL and CPEL Conference 2023  2023.03 

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  • Development of a Short Wavelength Infrared Emissive Dye with an Electron-Accepting N-Heteroacene Unit

    Masaki Nagaoka, Naoya Suzuki, Takeshi Maeda, Shigeyuki Yagi

    International CPL and CPEL Conference 2023  2023.03 

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  • Photoluminescence Properties of Symmetrical Dithienosilole Dimers Bearing Pyridyl Functional Groups International conference

    Ryoya Teshima, Naoya Suzuki, Takeshi Maeda, Shigeyuki Yagi

    The 95th Japan Society of Colour Material Anniversary Conference  2022.10  Japan Society of Colour Material

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    Presentation type：Poster presentation  

    Venue：Tokyo  

  • アルコキシ置換フラビリウム骨格を有する近赤外吸収クロコナイン色素の開殻性評価 Domestic conference

    大野友彰，前田壮志，酒巻大輔，藤原秀紀，八木繁幸

    色材協会創立95周年記念会議  2022.10  色材協会

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    Presentation type：Poster presentation  

    Venue：東京  

  • Creation of Full-Color Magnetic Circularly Polarized Organic Light-Emitting Diodes (MCP-OLED) Composed of Iridium Complexes International conference

    Maho Kitahara, Ryuta Shikura, Mao Kamimoto, Shigeyuki Yagi, Yoshitane Imai

    The 95th Japan Society of Colour Material Anniversary Conference  2022.10  Japan Society of Colour Material

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    Venue：Tokyo  

  • Development of Near-Infrared Phosphorescent Organoiridium(III) Complexes Bearing 2-Arylquinoxaline Cyclometalated Ligands International conference

    Ryuta Shikura, Naoya Suzuki, Takeshi Maeda, Shigeyuki Yagi, Seiji Akiyama

    The 95th Japan Society of Colour Material Anniversary Conference  2022.10  Japan Society of Colour Material

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    Presentation type：Poster presentation  

    Venue：Tokyo  

  • Experimental Evaluation of Intermediate Open Shell Character in Near-Infrared Absorbing Croconaine Dyes

    Takeshi Maeda, Taishi Oka, Daisuke Sakamaki, Hideki Fujiwara, Naoya Suzuki, Shigeyuki Yagi, Tatsuki Konishi, Kenji Kamada

    The 95th Japan Society of Colour Material Anniversary Conference  2022.10 

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    Presentation type：Oral presentation (general)  

  • イリジウム錯体によるフルカラー磁気円偏光有機発光ダイオード(MCP-OLED)

    北原真穂, 志倉瑠太, 紙本麻央, 八木繁幸, 今井喜胤

    第32回基礎有機化学討論会  2022.09 

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  • 発光性ランタノイド錯体における近赤外光学特性

    田島功樹, 志倉瑠太, 八木繁幸, 鈴木仁子, 中井英隆, 今井喜胤

    第32回基礎有機化学討論会  2022.09 

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  • インダンジオン骨格を有するスクアレン色素の合成と有機近赤外フォトディテクターへの応用

    前田壮志, 田中大気, 八木繁幸, 藤原秀紀

    第32回基礎有機化学討論会  2022.09 

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  • キラリティーと磁場との相乗効果によるイリジウム発光体からの円偏光発光(CPL)

    長谷川公紀, 原 健吾, 松平華奈, 長谷川真士, 八木繁幸, 今井喜胤

    2022年光化学討論会  2022.09 

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  • イリジウム錯体によるRGB+Y 磁気円偏光有機発光ダイオード(MCP-OLED)

    北原真穂, 志倉瑠太, 紙本麻央, 八木繁幸, 今井喜胤

    2022年光化学討論会  2022.09 

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  • 磁気円偏光有機発光ダイオード(MCP-OLED)における高性能化

    原 健吾, 射場日有人, 大久保貴志, 八木繁幸, 今井喜胤

    2022年光化学討論会  2022.09 

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  • Development of Phosphorescent Organometallic Complexes as Emitting Materials in OLED Invited International conference

    Shigeyuki Yagi

    International Symposium on Advanced Functional Materials (ISAFM 2022)  2022.07 

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    Presentation type：Oral presentation (invited, special)  

  • Phosphorescent Organometallic Emitters for Application in Electroluminescent Devices Invited International conference

    Shigeyuki Yagi

    International Conference on Chemistry and Applications of Soft Materials (CASM 2022)  2022.07 

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    Presentation type：Oral presentation (invited, special)  

  • Circularly Polarized Electroluminescence from Phosphorescent Organic Light-Emitting Diodes Driven by External Magnetic Field Invited International conference

    Shigeyuki Yagi

    International CREST-CPL Conference 2022  2022.03 

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    Presentation type：Oral presentation (invited, special)  

  • Development of Red-to-Near Infrared Fluorescent Dyes Based on a Group 14 Element-Bridged Bithiophene Dimer Scaffold Invited

    Shigeyuki Yagi

    The 10th East Asia Symposium on Functional Dyes and Advanced Materials (EAS 10)  2021.09 

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    Presentation type：Oral presentation (invited, special)  

  • 外部磁場印加による光学不活性なイリジウム錯体からのRGB+Y磁気円偏光発光（MCPL）特性 Domestic conference

    北原真穂，鈴木聖香，松平華奈，八木繁幸，藤木道也，今井 喜胤

    2021年光化学討論会  2021.09  光化学協会

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  • Development of Red-to-Near Infrared Fluorescent Dyes Based on a Group 14 Element-Bridged Bithiophene Dimer Scaffold Invited International conference

    Shigeyuki Yagi

    The 10th East Asia Symposium on Functional Dyes and Advanced Materials (EAS 10)  2021.09 

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  • オキソカーボン酸を中心骨格に持つ近赤外吸収ポリメチン色素の中間的な開殻性 Domestic conference

    岡　大志，前田壮志，酒巻大輔，藤原秀紀，八木繁幸

    第31回基礎有機化学討論会  2021.09  基礎有機化学会

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  • フラビリウム骨格とオキソカーボン酸残基からなるポリメチン色素の開殻性評価 Domestic conference

    大野友彰，岡大志，前田壮志，酒巻大輔，藤原秀紀，八木繁幸

    第31回基礎有機化学討論会  2021.09  基礎有機化学会

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  • 1,3-ジチオール環を置換した新規スクアライン色素の合成と物性 Domestic conference

    村田司，酒巻大輔，岡大志，前田壮志，八木繁幸，藤原秀紀

    第31回基礎有機化学討論会  2021.09  基礎有機化学会

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  • 外部磁場印加による白金錯体からの磁気円偏光発光（MCPL） Domestic conference

    松平華奈，原　健吾，布袋純一，八木繁幸，藤木道也，今井喜胤

    第31回基礎有機化学討論会  2021.09  基礎有機化学会

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  • りん光性白金(II)二核錯体の分子内エキシマー形成を利用した白色発光デバイスの作製 Domestic conference

    坂中　陽，前田壮志，八木繁幸

    2021年度色材研究発表会  2021.09  色材協会

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  • スクアレンおよびクロコナイン色素の中間的な開殻性 Domestic conference

    岡　大志，前田壮志，酒巻大輔，八木繁幸，藤原秀紀

    2021年度色材研究発表会  2021.09  色材協会

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  • スクアレン発色団が融合した構造を持つ色素の光学特性と電気化学特性評価 Domestic conference

    澤田隆平，前田壮志，八木繁幸

    2021年度色材研究発表会  2021.09  色材協会

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  • フラビリウム骨格とオキソカーボン酸残基からなる近赤外吸収色素の開殻性評価 Domestic conference

    大野友彰，岡　大志，前田壮志，酒巻大輔，藤原秀紀，八木繁幸

    2021年度色材研究発表会  2021.09  色材協会

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  • 外部磁場印加によるイリジウム錯体からのRGB+Y磁気円偏光発光（MCPL） Domestic conference

    北原真穂，鈴木聖香，松平華奈，八木繁幸，藤木道也，今井喜胤

    2021年度色材研究発表会  2021.09  色材協会

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  • 外部磁場印加による白金錯体からの磁気円偏光発光（MCPL） Domestic conference

    松平華奈，原　健吾，布袋純一，八木繁幸，藤木道也，今井喜胤

    2021年度色材研究発表会  2021.09  色材協会

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  • π共役を拡張したチエニルピリジニウム－環状エノラートベタイン色素の発光特性 Domestic conference

    三枝真央，鈴木直弥，前田壮志，八木繁幸

    2021年度色材研究発表会  2021.09  色材協会

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  • 2-(2-ヒドロキシフェニル)-2H-ベンゾトリアゾール誘導体と4-アセチルアミノ-18-ナフタルイミドのハイブリッド化合物の合成と光学特性 Domestic conference

    上坂敏之，前田壮志，八木繁幸

    2021年度色材研究発表会  2021.09  色材協会

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  • 溶液塗布型OLEDの作製に資するりん光性有機金属錯体の機能化 Invited Domestic conference

    八木 繁幸

    第244回フォトポリマー懇話会例会「励起三重項状態を利用した機能材料」  2021.06 

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  • 溶液塗布型OLEDの作製に資するりん光性有機金属錯体の機能化 Invited Domestic conference

    八木　繁幸

    第244回フォトポリマー懇話会例会  2021.06  フォトポリマー懇話会

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  • 液晶性スクアレン色素の光熱変換特性 Domestic conference

    前田壮志，高野将史，八木繁幸，大越研人

    第70回高分子学会年次大会  2021.05  高分子学会

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  • Development of Phosphorescent OLEDs Based on Organometallic Complexes towards Circularly Polarized Light-Emitting Devices Invited Domestic conference

    Shigeyuki Yagi

    2021.03 

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  • Development of Phosphorescent OLEDs Based on Organometallic Complexes towards Circularly Polarized Light-Emitting Devices Invited

    Shigeyuki Yagi

    日本化学会第101春季年会  2021.03  日本化学会

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  • 外部磁場印加によるイリジウムおよび白金錯体からの磁気円偏光発光（MCPL） Domestic conference

    松平華奈，布袋純一，山下健一，近藤喜郎，鈴木仁子，八木繁幸，藤木道也，今井喜胤

    日本化学会第101春季年会  2021.03  日本化学会

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  • 1,3-ジチオール環を置換した新規スクアライン色素の合成と物性 Domestic conference

    村田 司，酒巻 大輔，岡 大志，前田 壮志，八木 繁幸，藤原 秀紀

    日本化学会第101春季年会  2021.03  日本化学会

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  • フラビリウム骨格とオキソカーボン酸残基からなる近赤外吸収色素の合成と物性 Domestic conference

    大野 友彰，前田 壮志，酒巻 大輔，岡 大志，八木 繁幸，藤原 秀紀

    日本化学会第101春季年会  2021.03  日本化学会

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  • 励起子相互作用を示す縮環型スクアレン色素の光学および電気化学特性 Domestic conference

    澤田隆平，前田壮志，鈴木直弥，八木繁幸

    日本化学会第101春季年会  2021.03  日本化学会

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  • 近赤外吸収スクアレン色素の水中における自己組織化が光学特性に及ぼす効果 Domestic conference

    小寺秀門，前田壮志，澤田隆平，八木繁幸

    2020年度色材研究発表会  2020.10  色材協会

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    Presentation type：Poster presentation  

  • オキソカーボン酸を中心骨格に持つ近赤外吸収色素の開殻性評価 Domestic conference

    岡大志，前田壮志，酒巻大輔，八木繁幸，藤原秀紀

    2020年度色材研究発表会  2020.10  色材協会

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  • インダンジオン骨格を中心成分にもつスクアレン色素の電子吸収および電気化学特性 Domestic conference

    田中大気，前田壮志，八木 繁幸

    2020年度色材研究発表会  2020.10  色材協会

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  • 新規チエニルピリジニウム－環状エノラート型ベタイン色素の発光特性 Domestic conference

    三枝 真央，林 祐一朗，前田 壮志，八木 繁幸

    2020年度色材研究発表会  2020.10  色材協会

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  • 外部磁場印加によるイリジウムおよび白金錯体からの磁気円偏光発光（MCPL） Domestic conference

    松平華奈，近藤吉郎，鈴木仁子，八木繁幸，藤木道也，今井喜胤

    2020年度色材研究発表会  2020.10  色材協会

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  • シクロメタル化白金(II)錯体二量体の分子内エキシマー形成の制御と発光デバイスへの応用 Domestic conference

    坂中陽，布袋純一，前田壮志，八木 繁幸

    2020年度色材研究発表会  2020.10  色材協会

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  • シクロメタル化白金(II)錯体の二量体におけるsyn型およびanti型分子内エキシマーの形成 Domestic conference

    布袋純一，掛水海里，辻元英孝，前田壮志，八木繁幸

    2020年度色材研究発表会  2020.10  色材協会

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  • ピリジン環を機能性部位として有する架橋ビチオフェン誘導体の近赤外発光特性 Domestic conference

    森本あみ，林祐一朗，前田壮志，八木繁幸

    2020年度色材研究発表会  2020.10  色材協会

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  • 有機－ランタノイドハイブリッド発光体の磁気円偏光発光（MCPL） Domestic conference

    吉川弘基，木元隆裕，近藤吉朗，鈴木仁子，生駒愛華，八木繁幸，藤木道也，今井喜胤

    日本化学会第100春季年会  2020.03  日本化学会

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  • 液晶スクアレン色素の開発と光学特性評価 Domestic conference

    高野将史，前田壮志，島悠士朗，八木繁幸，大越研人

    日本化学会第100春季年会  2020.03  日本化学会

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  • Development of Cellular Imaging Probes Based on A–D–A-Type Fluorescent Dyes Domestic conference

    Ami Morimoto, Yuichiro Hayashi, Takeshi Maeda, Atsushi Harada, Shigeyuki Yagi

    日本化学会第100春季年会  2020.03  日本化学会

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  • Emission Mechanism of Pyridinium–Cyclic Enolate Betaine Dyes Domestic conference

    Yuichiro Hayashi, Takeshi Maeda, Shigeyuki Yagi

    日本化学会第100春季年会  2020.03  日本化学会

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  • Emission Color Tuning in 4-(2-Thienyl)pyridinium–Cyclic Enolate Betaine Dyes Domestic conference

    Mao Saikusa, Yuichiro Hayashi, Takeshi Maeda, Shigeyuki Yagi

    日本化学会第100春季年会  2020.03  日本化学会

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  • Fluorescence Properties of Cyclic Enolate-Modified 4-(4-N,N-Diphenylamino)stylyl)pyridinium Betaine Dyes Domestic conference

    Kei Shimizu, Yuichiro Hayashi, Takeshi Maeda, Shigeyuki Yagi

    日本化学会第100春季年会  2020.03  日本化学会

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  • Development of Dinuclear Organoplatinum(II) Complexes Towards Control of Excimer Photoluminescence Domestic conference

    Junichi Hotei, Kairi Kakemizu, Takeshi Maeda, Hidetaka Tsujimoto, Shigeyuki Yagi

    日本化学会第100春季年会  2020.03  日本化学会

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  • ピリジニウム－環状エノラート型ベタイン色素の発光特性（１）：発光メカニズム Domestic conference

    林祐一朗，前田壮志，八木繁幸

    日本化学会第100春季年会  2020.03  日本化学会

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  • ピリジニウム－環状エノラート型ベタイン色素の発光特性（２）：発光色の制御 Domestic conference

    三枝真央，林祐一朗，前田壮志，八木繁幸

    日本化学会第100春季年会  2020.03  日本化学会

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  • 環状エノラート部位を有する4-(4-N,N-ジフェニルアミノ)スチリル)ピリジニウムベタイン色素の発光特性 Domestic conference

    清水啓，林祐一朗，前田壮志，八木繁幸

    日本化学会第100春季年会  2020.03  日本化学会

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  • 非対称スクアレン発色団を剛直部とした液晶分子の合成と光学特性 Domestic conference

    高野将史，島悠士朗，前田壮志，八木繁幸，大越研人

    日本化学会第100春季年会  2020.03  日本化学会

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  • インダンジオン成分を有する対称型スクアレン色素の合成と光吸収・電気化学特性 Domestic conference

    田中大気，前田壮志，八木繁幸

    日本化学会第100春季年会  2020.03  日本化学会

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  • オキソカーボン酸残基を中心骨格に有する近赤外吸収色素の開殻性評価 Domestic conference

    岡大志，前田壮志，酒巻大輔，八木繁幸，藤原秀紀

    日本化学会第100春季年会  2020.03  日本化学会

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  • ジチエノシロールを基本骨格とする蛍光色素の細胞イメージングへの応用 Domestic conference

    森本あみ，林祐一朗，前田壮志，原田敦史，八木繁幸

    日本化学会第100春季年会  2020.03  日本化学会

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  • syn型分子内エキシマーの形成を指向した有機白金(II)錯体二量体の合成とその発光特性 Domestic conference

    布袋純一，掛水海里，前田壮志，辻元英孝，八木繁幸

    日本化学会第100春季年会  2020.03  日本化学会

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  • マルチカラーペリレン発光体の円偏光発光（CPL）および磁気円偏光発光（MCPL） Domestic conference

    木元隆裕，中島岳，吉村泰輝，靜間基博，八木繁幸，今井喜胤

    日本化学会第100春季年会  2020.03  日本化学会

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  • 発光体の溶液および固体状態における円偏光発光（CPL）および磁気円偏光発光（MCPL） Domestic conference

    松平華奈，田口周平，高桑栄，味村優輝，近藤吉朗，鈴木仁子，八木繁幸，今井喜胤

    日本化学会第100春季年会  2020.03  日本化学会

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  • Development of Organoplatinum(II) Complexes Exhibiting Efficient Excimer-Based Phosphorescence towards OLED Application Invited

    Shigeyuki Yagi

    3rd International Conference on Advanced Functional Materials (ICAFM-2019)  2019.12 

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  • Development of Organoplatinum(II) Complexes Exhibiting Efficient Excimer-Based Phosphorescence towards OLED Application Invited International conference

    Shigeyuki Yagi

    3rd International Conference on Advanced Functional Materials (ICAFM-2019)  2019.12 

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  • Unique Photoluminescence Behavior of Phosphorescent Organoplatinum(II) Complexes Invited International conference

    Shigeyuki Yagi

    Special Lecture at CSIR-National Institute for Interdisciplinary Science and Technology  2019.12  CSIR-National Institute for Interdisciplinary Science and Technology

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  • Phosphorescent Organometallic Complexes Aimed at Fabrication of Electroluminescent Devices Invited

    Shigeyuki Yagi

    International Symposium on Circularly Polarized Luminescence and the Related Phenomena  2019.11 

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  • Phosphorescent Organometallic Complexes Aimed at Fabrication of Electroluminescent Devices Invited International conference

    Shigeyuki Yagi

    International Symposium on Circularly Polarized Luminescence and the Related Phenomena  2019.11 

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  • 二つのスクアレン色素で構成された近赤外吸収色素の合成と光学特性 Domestic conference

    木下早紀，前田壮志，八木繁幸

    大阪府立大学21世紀科学研究センター分子エレクトロニックデバイス研究所第21回研究会  2019.11  大阪府立大学21世紀科学研究センター分子エレクトロニックデバイス研究所

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  • 長鎖アルキル基を有するスクアレン色素の合成と液晶性評価

    髙野将史，前田壮志，八木繁幸，大越研人

    大阪府立大学21世紀科学研究センター分子エレクトロニックデバイス研究所第21回研究会  2019.11  大阪府立大学21世紀科学研究センター分子エレクトロニックデバイス研究所

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  • 白金(II)錯体の二量化による分子内エキシマー発光の発現 Domestic conference

    布袋 純一，山下晃平，前田壮志，八木繁幸

    大阪府立大学21世紀科学研究センター分子エレクトロニックデバイス研究所第21回研究会  2019.11  大阪府立大学21世紀科学研究センター分子エレクトロニックデバイス研究所

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  • 高効率な発光を示す近赤外蛍光色素の創出 Domestic conference

    森本 あみ，林祐一朗，前田壮志，八木繁幸

    大阪府立大学21世紀科学研究センター分子エレクトロニックデバイス研究所第21回研究会  2019.11  大阪府立大学21世紀科学研究センター分子エレクトロニックデバイス研究所

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  • シクロメタル化白金錯体のエキシマー形成における置換基効果 Domestic conference

    上田悟司，岡村奈生己，前田壮志，八木繁幸

    大阪府立大学21世紀科学研究センター分子エレクトロニックデバイス研究所第21回研究会  2019.11  大阪府立大学21世紀科学研究センター分子エレクトロニックデバイス研究所

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  • C^N^C型シクロメタル化配位子を有する白金錯体のりん光メカノクロミズム Domestic conference

    有薗春香，岡村奈生己，前田壮志，八木繁幸

    大阪府立大学21世紀科学研究センター分子エレクトロニックデバイス研究所第21回研究会  2019.11  大阪府立大学21世紀科学研究センター分子エレクトロニックデバイス研究所

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  • Control of Excimer-Based Phosphorescence of Heteroleptic Cyclometalated Platinum(II) Complexes Invited International conference

    Shigeyuki Yagi

    The 9th East Asia Synposium on Functional Dyes and Advanced Materials  2019.09 

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Works

  • Synthesis of novel blue-phosphorescent dyes

    2005

  • 新規な青色発光（燐光）色素の合成

    2005

Outline of collaborative research (seeds)

  • Development of Organic Materials aimed at LC Display Application

  • Design and Synthesis of Phosphorescent Materials for Organic Light-emitting Diode

  • Design and Synthesis of pi-Conjugated molecules aimed at Organic Light-emitting Diode Application

  • Development of pi-Conjugated Polymer Materials for Organic Electronics

  • Development of Organic Functional Materials for Photoelectric Conversion Devices

Outline of education staff

  • 有機化学、有機機能化学に係る研究・教育

Charge of on-campus class subject

  • Advanced Applied Chemistry III

    2021    

  • Organic Chemistry IA

    2021    

  • Introduction to Physical Chemistry

    2021    

  • Introduction to Physical Chemistry

    2021    

  • Introduction to Physical Chemistry

    2021    

  • Advanced Chemistry of Organic Functional Materials

    2021    

  • Organic Functional Materials Chemistry

    2021    

  • Selected Topics in Organic Functional Materials Chemistry

    2021    

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Social Activities

  • 第115回テクノラボツアー　有機EL・最近の動向 りん光デンドリマーを用いた積層型有機発光ダイオードの作製

    2018.04 - 2019.03

  • 平成30年度大阪府立大学公開講座21世紀科学セミナー 分子レベルで見る有機発光デバイスの世界

    2018.04 - 2019.03

  • 近畿化学協会ヘテロ原子部会平成27年度第3回懇話会 有機発光デバイスを指向した高機能りん光性有機金属錯体の創製

    2015.04 - 2016.03

  • 高分子学会印刷・情報記録・表示研究会および光反応・電子用材料研究会　講師 塗布型OLEDを指向したりん光性有機金属錯体の配位子デザイン

    2014.04 - 2015.03

  • (社)大阪工研協会第43回有機合成セミナー「新領域・新分野を開拓する革新技術」 配位子のp共役デザインによるりん光性有機金属錯体の高機能化

    2011.04 - 2012.03

  • 近畿化学協会機能性色素部会見学研修セミナー「大阪府立大学ＬＥＤ植物工場」 溶液塗布によって作製可能なりん光型有機ＥＬ素子の開発と白色光源への応用

    2011.04 - 2012.03

  • 戦略的基盤技術高度化支援事業成果発表会 りん光性有機金属錯体を用いた塗布型高分子電界発光素子（ＰＬＥＤ）の開発

    2010.04 - 2011.03

  • 大阪府立大学／りそなグループ技術懇親会 有機EL用りん光性有機金属錯体の開発

    2010.04 - 2011.03

  • 色材セミナー「環境・省エネに配慮した色材開発の最新動向」 溶液塗布型りん光性有機EL素子の開発と白色光源への応用

    2010.04 - 2011.03

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Visiting Lectures　⇒ Link to the list of Visiting Lectures

  • 有機EL照明を指向したりん光性有機金属錯体の開発

    Category：Science (mathematics, physics, chemistry, biology, geology, biochemistry),　Engineering (machinery, electronics / physics, electrical / electronics, electrical information, chemical biotechnology, architecture, cities (civil engineering / environment), material chemistry, aerospace, marine systems, applied chemistry, chemistry, materials)

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    Audience：College students,　Teachers,　Researchers,　General,　Company

    Keyword：有機ＥＬ照明、りん光、有機金属錯体 

    近年、有機ELによる照明機器の実用化に向けた素子開発が活発化している。高性能な照明用有機EL素子の開発には有機金属錯体を基盤とするりん光材料の利用が不可欠であるが、素子パフォーマンスのさらなる向上を実現するためには分子レベルに基づいた材料設計が必要である。本講演では白金およびイリジウム錯体を中心に、りん光材料の基礎的特性から有機EL開発に向けた材料設計について、最新の研究動向を交えながら解説する。

  • 有機ＥＬ用りん光性有機金属錯体の開発

    Category：Science (mathematics, physics, chemistry, biology, geology, biochemistry),　Engineering (machinery, electronics / physics, electrical / electronics, electrical information, chemical biotechnology, architecture, cities (civil engineering / environment), material chemistry, aerospace, marine systems, applied chemistry, chemistry, materials)

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    Audience：College students,　Teachers,　Researchers,　General,　Company

    Keyword：有機ＥＬ素子、りん光、有機金属錯体 

    近年、有機EL素子を利用した次世代FPDや照明機器が実用化レベルに達しつつある。しかしながら、デバイス作製における生産コストの低減化や素子パフォーマンスのさらなる向上など、有機EL製品の普及に向けた改善点が多く残されている。本講演では、高効率発光材料として有機ELに用いられているりん光性金属錯体について、これまでの研究を踏まえながら最新の研究動向について詳解する。

  • 光る有機化合物　～身近な化学から先端技術まで～

    Category：Science (mathematics, physics, chemistry, biology, geology, biochemistry),　Engineering (machinery, electronics / physics, electrical / electronics, electrical information, chemical biotechnology, architecture, cities (civil engineering / environment), material chemistry, aerospace, marine systems, applied chemistry, chemistry, materials)

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    Audience：High school students,　College students,　Teachers,　Researchers,　General

    Keyword：蛍光、りん光、機能性色素、化学発光、生物発光、有機ＥＬ素子 

    有機化合物は炭素原子を含む物質であり、医薬品から繊維・プラスチックまで、多くの有機化合物が私たちの生活を支え、豊かにしてくれています。中でも有機色素は、その構造が光や色と大きな関わりがあることから、光科学技術分野でたいへん注目されています。本講演では、夏の風物詩である“ホタルの光”から携帯電話や薄型テレビで今話題の“有機ＥＬ”まで、光る有機色素のもつ特徴を紹介しながら先端科学の世界をわかりやすく解説し、化学の楽しさ、研究のすばらしさについて語りたいと思います。

Job title

  • Job title within the department

    Graduate School of Engineering Division of Science and Engineering for Materials, Chemistry and Biology 

    専攻長  2022.04 - 2024.03