Project/Area Number |
21H02019
|
Research Category |
Grant-in-Aid for Scientific Research (B)
|
Allocation Type | Single-year Grants |
Section | 一般 |
Review Section |
Basic Section 35030:Organic functional materials-related
|
Research Institution | Kyoto University (2022-2023) Kwansei Gakuin University (2021) |
Principal Investigator |
|
Project Period (FY) |
2021-04-01 – 2024-03-31
|
Project Status |
Completed (Fiscal Year 2023)
|
Budget Amount *help |
¥17,160,000 (Direct Cost: ¥13,200,000、Indirect Cost: ¥3,960,000)
Fiscal Year 2023: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
Fiscal Year 2022: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
Fiscal Year 2021: ¥5,980,000 (Direct Cost: ¥4,600,000、Indirect Cost: ¥1,380,000)
|
Keywords | OLED / 色純度 / 熱活性化遅延蛍光 / 有機ホウ素化合物 / エネルギー変換効率 / 有機EL / 有機ホウ素 / 多重共鳴効果 |
Outline of Research at the Start |
これまでに,ホウ素と窒素の多重共鳴効果を用いることで,有機発光材料の振電相互作用の抑制と発光スペクトルの狭帯域化に成功している。本研究では,この分子設計の下,青色,緑色,赤色の狭帯域発光材料を開発し,エネルギー変換効率と耐久性を兼ね備えた高色純度のフルカラー有機EL素子(OLED)の実現を目指す。
|
Outline of Final Research Achievements |
By using the "multiple resonance effect" of boron and nitrogen atoms, we have successfully minimized the energy gap between the singlet excited state (S1) and the triplet excited state (T1) and suppressed structural changes in the excited state. This has led to the development of thermally activated delayed fluorescence (TADF) materials that exhibit ultrapure blue emission. In this study, under this molecular design, we developed narrowband green and red TADF materials in addition to improving the reverse intersystem crossing rate of blue TADF materials by optimizing the molecular structure. Furthermore, using the synthesized luminescent materials, we successfully developed full-color organic EL devices (OLEDs) with excellent energy conversion efficiency and color purity.
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Academic Significance and Societal Importance of the Research Achievements |
OLEDは,ディスプレイ分野での実用化が進んでいるが,エネルギー変換効率に課題を残しており,高効率なTADF材料の開発が盛んに行われている。一般的なTADF材料は幅広な発光スペクトルを示すという欠点があるが,本研究で開発した青色・緑色・赤色TADF材料は,20~40 nm程度の狭帯域発光を示すことから,ディスプレイ応用において光学フィルターにより余分なスペクトル領域をカットする必要がなくなり,エネルギー変換効率の大幅な向上,それに伴う消費電力の抑制が可能となる。これに加えて,最大輝度の向上や高精彩化も可能となり,社会的に大きな波及効果が期待できる。
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