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Design of high-performance delayed fluorescence materials with controlled spin-orbit coupling and their application in organic light-emitting diodes

Research Project

Project/Area Number 19K15651
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 35030:Organic functional materials-related
Research InstitutionKyushu University

Principal Investigator

Park In Seob  九州大学, 稲盛フロンティア研究センター, 学術研究員 (20830938)

Project Period (FY) 2019-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2020: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2019: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywords熱活性化遅延蛍光 / 発光ダイオード / 有機半導体 / 有機EL / 青色有機ELデバイス / スピン軌道相互作用
Outline of Research at the Start

有機ELデバイスで最大の未解決課題は、高電流密度域においてEL量子効率の低下(ロールオフ)を抑制できる発光材料の実現である。申請者らの最近の研究によって、純粋な有機発光材料である熱活性化遅延蛍光(TADF)においてスピン軌道相互作用を増大させることでロールオフを劇的に低減できる可能性を見出している。本研究では、申請者らが確立してきたTADF分子設計指針に、スピン軌道相互作用を同時に制御できるように高度に発展させ、内部量子効率100%の極めて高いEL発光特性とロールオフの低減を両立できる革新的TADF発光材料の創製を目指す。実用水準の高性能有機ELデバイスの開発に繋げる。

Outline of Final Research Achievements

Thermally activated delayed fluorescence (TADF) is receiving great attention as a pure organic molecular system that does not use any heavy atoms such as iridium or platinum to realize high-efficiency organic light-emitting diodes (OLEDs). In this study, a series of triazine-carbazole-based donor-acceptor type TADF molecules were designed and synthesized. These new materials exhibited blue TADF emissions with high photoluminescence quantum yields of close to 100%. As a result, blue TADF-OLEDs based on these emitters achieved high maximum external electroluminescence quantum efficiencies up to 31.9%.

Academic Significance and Societal Importance of the Research Achievements

有機EL素子は、高効率発光、低消費電力駆動、軽量化できる等の優れた特長を有していることから、各種ディスプレイとして実用化され広く普及しつつある。しかし、現在までに実用化されている青色発光材料は、有機EL 素子の発光効率が比較的低いことや、耐久性が低いことなどの問題がある。本研究では、熱活性化遅延蛍光メカニズムを用いした高効率な青色発光材料の開発に成功した。今回の結果は、高効率青色有機 EL素子を実現に寄与すると期待される。

Report

(3 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • Research Products

    (10 results)

All 2021 2020 2019

All Journal Article (8 results) (of which Int'l Joint Research: 7 results,  Peer Reviewed: 8 results,  Open Access: 1 results) Presentation (2 results) (of which Int'l Joint Research: 2 results)

  • [Journal Article] cis-Quinacridone-Based Delayed Fluorescence Emitters: Seemingly Old but Renewed Functional Luminogens2021

    • Author(s)
      Hyukgi Min, In Seob Park, and Takuma Yasuda
    • Journal Title

      Angewandte Chemie International Edition

      Volume: 60 Issue: 14 Pages: 7643-7648

    • DOI

      10.1002/anie.202016914

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Phenyl-Triggered Photophysical Switching between Normal Fluorescence and Delayed Fluorescence in Phthalonitrile-Based Luminophores2021

    • Author(s)
      In seob Park, Hyukgi Min, and Takuma Yasuda
    • Journal Title

      Aggregate

      Volume: 2 Issue: 1 Pages: 145-150

    • DOI

      10.1002/agt2.14

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Full-Color, Narrowband, and High-Efficiency Electroluminescence from Boron and Carbazole Embedded Polycyclic Heteroaromatics2020

    • Author(s)
      Minlang Yang, In Seob Park, and Takuma Yasuda
    • Journal Title

      Journal of the American Chemical Society

      Volume: 142 Issue: 46 Pages: 19468-19472

    • DOI

      10.1021/jacs.0c10081

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Mechanochromic Delayed Fluorescence Switching in Propeller‐Shaped Carbazole?Isophthalonitrile Luminogens with Stimuli‐Responsive Intramolecular Charge‐Transfer Excited States2020

    • Author(s)
      Yang Minlang、Park In Seob、Miyashita Yasuhiro、Tanaka Katsunori、Yasuda Takuma
    • Journal Title

      Angewandte Chemie International Edition

      Volume: 59 Issue: 33 Pages: 13955-13961

    • DOI

      10.1002/anie.202005584

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] White-Light Emission from a Pyrimidine-Carbazole Conjugate with Tunable Phosphorescence-Fluorescence Dual Emission and Multicolor Emission Switching2020

    • Author(s)
      Ishi-i Tsutomu、Tanaka Honoka、Park In Seob、Yasuda Takuma、Kato Shin-ichiro、Ito Mitsunori、Hiyoshi Hidetaka、Matsumoto Taisuke
    • Journal Title

      Chemical Communications

      Volume: 56 Issue: 29 Pages: 4051-4054

    • DOI

      10.1039/d0cc00251h

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Dipolar and Quadrupolar Luminophores Based on 1,8-Dimethylcarbazole-Triazine Conjugates for High-Efficiency Blue Thermally Activated Delayed Fluorescence OLEDs2020

    • Author(s)
      Hyukgi Min, In Seob Park, Takuma Yasuda
    • Journal Title

      ChemPhotoChem

      Volume: 4 Issue: 1 Pages: 82-88

    • DOI

      10.1002/cptc.201900186

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] An Isonicotinonitrile-Based Blue Thermally Activated Delayed Fluorescence Emitter2020

    • Author(s)
      In Seob Park, Takuma Yasuda
    • Journal Title

      Chemistry Letters

      Volume: 49 Issue: 2 Pages: 210-213

    • DOI

      10.1246/cl.190808

    • NAID

      130007795178

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Pentacyclic Ladder-Heteraborin Emitters Exhibiting High-Efficiency Blue Thermally Activated Delayed Fluorescence with an Ultrashort Emission Lifetime2019

    • Author(s)
      Agou Tomohiro, Matsuo Kyohei, Kawano Rei, Park In Seob, Hosoya Takaaki, Fukumoto Hiroki, Kubota Toshio, Mizuhata Yoshiyuki, Tokitoh Norihiro, Yasuda Takuma
    • Journal Title

      ACS Materials Letters

      Volume: 2 Issue: 1 Pages: 28-34

    • DOI

      10.1021/acsmaterialslett.9b00433

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] A Novel Design Strategy for High-Performance Delayed Fluorescence Emitters Using Dibenzoheteraborins for Organic Light-Emitting Diodes2019

    • Author(s)
      In Seob Park, Takuma Yasuda
    • Organizer
      The 24th Joint Seminar of the Kyushu Branch of the CSJ and the Busan Branch of KCS
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Design of High-Efficiency Blue Thermally Activated Delayed Fluorescence Emitters for Organic Light-Emitting Diodes2019

    • Author(s)
      In Seob Park, Takuma Yasuda
    • Organizer
      SPIE. OPTICS + PHOTONICS 2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research

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Published: 2019-04-18   Modified: 2022-01-27  

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