| 학회 |
한국고분자학회 |
| 학술대회 |
2019년 가을 (10/09 ~ 10/11, 제주컨벤션센터) |
| 권호 |
44권 2호 |
| 발표분야 |
분자전자 부문위원회 II |
| 제목 |
ortho-substituted pyridinecarbonitrile derivatives for high-performance TADF-OLEDs |
| 초록 |
Thermally activated delayed fluorescence (TADF) emitters can utilize triplet excitons for fluorescence by reverse intersystem crossing (RISC), which is resulted from small energy gap between singlet and triplet state. For the design of these TADF emitters, there are two conflicted considerations; ⅰ) spatially separated distribution of the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) and ⅱ) efficient intramolecular charge transfer (ICT) within overlap between HOMO and LUMO. In this study, we designed and investigated two pyridinecarbonitrile-based TADF molecules with the donor moieties at ortho position. These compounds exhibit extremely small ΔEST (< 0.1 eV) and relatively short radiative decay lifetime decay (8-13 μs). The devices employing these emitters show green emission with maximum external quantum efficiencies (ηext) up to 20%. This result demonstrates the possibility of ortho-substituted molecular design in TADF emitters. |
| 저자 |
최신형1, 이찬희1, Adachi Chihaya2, 이세연1
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| 소속 |
1동국대, 2Kyushu Univ. |
| 키워드 |
molecular design; TADF emitter
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| E-Mail |
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