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Degradation mechanism of TADF OLED and advanced materials

Research Project

Project/Area Number 17H01232
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field Device related chemistry
Research InstitutionKyushu University

Principal Investigator

Adachi Chihaya  九州大学, 工学研究院, 教授 (30283245)

Co-Investigator(Kenkyū-buntansha) 合志 憲一  九州大学, 工学研究院, 助教 (50462875)
中野谷 一  九州大学, 工学研究院, 准教授 (90633412)
Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥43,810,000 (Direct Cost: ¥33,700,000、Indirect Cost: ¥10,110,000)
Fiscal Year 2019: ¥13,780,000 (Direct Cost: ¥10,600,000、Indirect Cost: ¥3,180,000)
Fiscal Year 2018: ¥13,650,000 (Direct Cost: ¥10,500,000、Indirect Cost: ¥3,150,000)
Fiscal Year 2017: ¥16,380,000 (Direct Cost: ¥12,600,000、Indirect Cost: ¥3,780,000)
KeywordsOLED / 有機EL / TADF / 熱活性化遅延蛍光 / 三重項励起子 / ドナー / アクセプター / 耐久性 / 有機ELデバイス / スルースペース / 熱活性化遅延蛍光材料
Outline of Final Research Achievements

OLEDs using TADF molecules are a breakthrough technology that can convert electric current to light with almost 100% efficiency using relatively simple aromatic compounds. Under current excitation, TADF molecules can up-convert a triplet excited state to a singlet excited state with 100% quantum efficiency. However, since it passes through the triplet state, it has a relatively short device lifetime, and it has been expected that the durability is improved by the short triplet excitation lifetime. In this study, we succeeded in creating an epoch-making TADF molecule with triplet excitation lifetime of 750ns by using precise stereo-control of donor and acceptor units and through-space interaction.

Academic Significance and Societal Importance of the Research Achievements

TADF分子は従来の蛍光分子、りん光分子に加え、第三の発光分子としての地位を築くことができた。一重項と三重項励起子のエネルギー差を室温程度まで小さくすることで、三重項から一重励起状態への逆系間交差(RISC)がほぼ100%の効率で実現できたのであるが、その速度は速くてもマイクロ秒程度に限られていた。本研究では、精密な分子設計を通して、750nsの速度でのアップコンバージョンを実現することができ、TADF分子の新たな可能性を開拓することができた。本研究は、芳香族系分子の高速スピン変換の可能性を示したことに加え、耐久性に富むOLEDへの展開を可能とし、実用的な視点からも大きな成果が得られた。

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Annual Research Report
  • 2017 Annual Research Report
  • Research Products

    (4 results)

All 2020 2019 2018

All Journal Article (2 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 1 results) Patent(Industrial Property Rights) (2 results)

  • [Journal Article] Nanosecond-Time-Scale Delayed Fluorescence Molecule for Deep-Blue OLEDs with Small Efficiency Rolloff2020

    • Author(s)
      Jong Uk Kim; In Seob Park; Chin-Yiu Chan; Masaki Tanaka; Youichi Tsuchiya; Hajime Nakanotani; Chihaya Adachi
    • Journal Title

      Nature Communications

      Volume: 11 Issue: 1 Pages: 1765-1765

    • DOI

      10.1038/s41467-020-15558-5

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Dithia[3.3]paracyclophane Core: a Versatile Platform for Fine Triplet State Tuning and Through Space TADF Emission2019

    • Author(s)
      Morgan Auffray, Dae Hyeon Kim, Jong Uk Kim, Fatima Bencheikh, David Kreher, Qisheng Zhang, Anthony Daleo, Jean-Charles Ribierre, Fabrice Mathevet, Chihaya Adachi
    • Journal Title

      Chemistry - An Asian Journal

      Volume: 印刷中

    • Related Report
      2018 Annual Research Report
  • [Patent(Industrial Property Rights)] 化合物、発光材料および有機発光素子2018

    • Inventor(s)
      Chihaya Adachi
    • Industrial Property Rights Holder
      Chihaya Adachi
    • Industrial Property Rights Type
      特許
    • Filing Date
      2018
    • Related Report
      2018 Annual Research Report
  • [Patent(Industrial Property Rights)] 化合物、発光材料および有機発光素子2018

    • Inventor(s)
      Chihaya Adachi
    • Industrial Property Rights Holder
      Chihaya Adachi
    • Industrial Property Rights Type
      特許
    • Filing Date
      2018
    • Related Report
      2018 Annual Research Report

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Published: 2017-04-28   Modified: 2021-02-19  

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