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Organic light-emitting diodes possess 200% exciton production efficiency

Research Project

Project/Area Number 18H02047
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 35030:Organic functional materials-related
Research InstitutionKyushu University

Principal Investigator

Nakanotani Hajime  九州大学, 工学研究院, 准教授 (90633412)

Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥18,330,000 (Direct Cost: ¥14,100,000、Indirect Cost: ¥4,230,000)
Fiscal Year 2020: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2019: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2018: ¥16,250,000 (Direct Cost: ¥12,500,000、Indirect Cost: ¥3,750,000)
Keywords有機EL / 一重項励起子開裂 / 近赤外有機EL / 熱活性化遅延蛍光 / 近赤外発光 / 一重項開裂 / エネルギー移動 / 項間 / 近赤外光源 / 有機エレクトロルミネッセンス
Outline of Final Research Achievements

In this study, we aimed to dramatically improve the exciton generation yield in organic light-emitting diode (OLED) by fusing two different spin conversion mechanisms: (1) thermally-activated delayed fluorescence (TADF), and (2) singlet fission (SF) processes. During this research project, the world's first SF-type OLED that exhibits over 100% exciton generation yield was realized by incorporating molecules showing SF into the OLED. Further, the basic physics of the TADF process was clarified from both experimental and theoretical aspects, and we succeeded in developing a highly efficient and durable NIR-OLED that can be applied to practical applications. Through this research project, the feasibility of "OLED exhibiting exciton generation yield of 200%" was obtained.

Academic Significance and Societal Importance of the Research Achievements

本研究課題において、SF過程を示す分子をOLEDにおけるホスト材料として用いることで、励起子生成効率が100%を超える世界初のSF型OLEDを実現した。また、TADF過程の基礎物理を明らかにした。そしてこれらの学術的知見を基に、TADF過程とSF過程という二つの異なるスピン変換機構を融合することで、従来信じられていた励起子生成効率の理論限界値を超えることができる可能性を見出した。これにより、OLEDの特徴を生かしつつ、その発光強度は飛躍的に向上し、これまで想定されてきた用途のみならず、センサ光源や通信用光源等の新たな有機エレクトロニクス分野の学術・産業領域を開拓・創成できると期待される。

Report

(4 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Annual Research Report
  • 2018 Annual Research Report
  • Research Products

    (21 results)

All 2021 2020 2019 2018

All Journal Article (12 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 12 results,  Open Access: 3 results) Presentation (7 results) (of which Int'l Joint Research: 3 results,  Invited: 7 results) Book (1 results) Patent(Industrial Property Rights) (1 results)

  • [Journal Article] Highly Efficient Near‐Infrared Electrofluorescence from a Thermally Activated Delayed Fluorescence Molecule2021

    • Author(s)
      Balijapalli Umamahesh、Nagata Ryo、Yamada Nishiki、Nakanotani Hajime、Tanaka Masaki、D'Al?o Anthony、Placide Virginie、Mamada Masashi、Tsuchiya Youichi、Adachi Chihaya
    • Journal Title

      Angewandte Chemie International Edition

      Volume: 60 Issue: 15 Pages: 8477-8482

    • DOI

      10.1002/anie.202016089

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Thermally-activated Delayed Fluorescence for Light-emitting Devices2021

    • Author(s)
      Nakanotani Hajime、Tsuchiya Youichi、Adachi Chihaya
    • Journal Title

      Chemistry Letters

      Volume: 50 Issue: 5 Pages: 938-948

    • DOI

      10.1246/cl.200915

    • NAID

      130008040396

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Role of Spontaneous Orientational Polarization in Organic Donor?Acceptor Blends for Exciton Binding2020

    • Author(s)
      Ueda Yuuhi、Nakanotani Hajime、Hosokai Takuya、Tanaka Yuya、Hamada Hokuto、Ishii Hisao、Santo Shuhei、Adachi Chihaya
    • Journal Title

      Advanced Optical Materials

      Volume: 8 Issue: 21 Pages: 2000896-2000896

    • DOI

      10.1002/adom.202000896

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Understanding degradation of organic light-emitting diodes from magnetic field effects2020

    • Author(s)
      Tanaka Masaki、Nagata Ryo、Nakanotani Hajime、Adachi Chihaya
    • Journal Title

      Communications Materials

      Volume: 1 Issue: 1 Pages: 18-18

    • DOI

      10.1038/s43246-020-0019-0

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Observation of Nonradiative Deactivation Behavior from Singlet and Triplet States of Thermally Activated Delayed Fluorescence Emitters in Solution2020

    • Author(s)
      Naoto Notsuka, Hajime Nakanotani, Hiroki Noda, Kenichi Goushi, Chihaya Adachi
    • Journal Title

      The Journal of Physical Chemistry Letters

      Volume: 11 Issue: 2 Pages: 562-566

    • DOI

      10.1021/acs.jpclett.9b03302

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] The Role of Reverse Intersystem Crossing Using a TADF‐Type Acceptor Molecule on the Device Stability of Exciplex‐Based Organic Light‐Emitting Diodes2020

    • Author(s)
      Thanh Ba Nguyen, Hajime Nakanotani, Takuji Hatakeyama, Chihaya Adachi
    • Journal Title

      Advanced Materials

      Volume: 32 Issue: 9 Pages: 1906614-1906614

    • DOI

      10.1002/adma.201906614

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Critical role of intermediate electronic states for spin-flip processes in charge-transfer-type organic molecules with multiple donors and acceptors2019

    • Author(s)
      Noda Hiroki、Chen Xian-Kai、Nakanotani Hajime、Hosokai Takuya、Miyajima Momoka、Notsuka Naoto、Kashima Yuuki、Br?das Jean-Luc、Adachi Chihaya
    • Journal Title

      Nature Materials

      Volume: 18 Issue: 10 Pages: 1084-1090

    • DOI

      10.1038/s41563-019-0465-6

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Suppression of Structural Change upon S1-T1 Conversion Assists the Thermally Activated Delayed Fluorescence Process in Carbazole-Benzonitrile Derivatives2019

    • Author(s)
      Saigo Masaki、Miyata Kiyoshi、Tanaka Sei’ichi、Nakanotani Hajime、Adachi Chihaya、Onda Ken
    • Journal Title

      The Journal of Physical Chemistry Letters

      Volume: 10 Issue: 10 Pages: 2475-2480

    • DOI

      10.1021/acs.jpclett.9b00810

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Slow recombination of spontaneously dissociated organic fluorophore excitons2019

    • Author(s)
      Takahiko Yamanaka, Hajime Nakanotani, Chihaya Adachi
    • Journal Title

      Nature Communications

      Volume: 10 Issue: 1 Pages: 5748-5748

    • DOI

      10.1038/s41467-019-13736-8

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Highly Efficient Thermally Activated Delayed Fluorescence with Slow Reverse Intersystem Crossing2019

    • Author(s)
      Noda Hiroki、Nakanotani Hajime、Adachi Chihaya
    • Journal Title

      Chemistry Letters

      Volume: 48 Issue: 2 Pages: 126-129

    • DOI

      10.1246/cl.180813

    • NAID

      130007590341

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Exploiting Singlet Fission in Organic Light-Emitting Diodes2018

    • Author(s)
      Nagata Ryo、Nakanotani Hajime、Potscavage William J.、Adachi Chihaya
    • Journal Title

      Advanced Materials

      Volume: 30 Issue: 33 Pages: 1801484-1801484

    • DOI

      10.1002/adma.201801484

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Excited state engineering for efficient reverse intersystem crossing2018

    • Author(s)
      Noda Hiroki、Nakanotani Hajime、Adachi Chihaya
    • Journal Title

      Science Advances

      Volume: 4 Issue: 6

    • DOI

      10.1126/sciadv.aao6910

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] 有機CT励起状態が切り拓く多彩な有機光エレクトロニクス2019

    • Author(s)
      中野谷 一
    • Organizer
      高分子討論会
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] Manipulation of the spin-flip process toward to development of high-performance organic light-emitting devices2019

    • Author(s)
      Hajime Nakanotani
    • Organizer
      CEMS Topical Meeting
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] Manipulation of spin-flip process toward to development of high-performance organic light-emitting devices2019

    • Author(s)
      Hajime Nakanotani
    • Organizer
      International Conference on Display Technology 2019
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Organic light-emitting devices with E-type delayed fluorescence emitters2018

    • Author(s)
      Hajime Nakanotani
    • Organizer
      THE 25th INTERNATIONAL WORKSHOP ON ACTIVE-MATRIX FLATPANEL DISPLAYS AND DEVICES
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 熱活性化遅延蛍光分子における項間交差過程の理解2018

    • Author(s)
      Hajime Nakanotani
    • Organizer
      光化学討論会
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Presentation] High-performance organic light-emitting devices with E-type delayed fluorescence emitters2018

    • Author(s)
      Hajime Nakanotani
    • Organizer
      KJF-ICOMEP 2018
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 有機分子における項間交差過程の理解:高性能有機ELの実現に向けて2018

    • Author(s)
      Hajime Nakanotani
    • Organizer
      高分子学会 有機エレクトロニクス研究会
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Book] 未来を拓く多彩な色素材料2021

    • Author(s)
      日本化学会
    • Total Pages
      212
    • Publisher
      化学同人
    • ISBN
      9784759814002
    • Related Report
      2020 Annual Research Report
  • [Patent(Industrial Property Rights)] 化合物、発光材料、遅延蛍光材料および有機発光素子2020

    • Inventor(s)
      Uma, 永田, 土屋, 中野谷, 安達
    • Industrial Property Rights Holder
      Uma, 永田, 土屋, 中野谷, 安達
    • Industrial Property Rights Type
      特許
    • Industrial Property Number
      2020-184095
    • Filing Date
      2020
    • Related Report
      2020 Annual Research Report

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Published: 2018-04-23   Modified: 2022-01-27  

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