期刊
ACS MATERIALS LETTERS
卷 2, 期 1, 页码 28-34出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsmaterialslett.9b00433
关键词
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资金
- Ibaraki University Priority Research Grant
- Shorai Foundation for Science and Technology
- Hirose International Scholarship Foundation
- MST Foundation
- Research Foundation for Opto-Science and Technology
- Fukuoka Naohiko Memorial Foundation
- Research Foundation for the Electrotechnology of Chubu
- ICR-JURC, Kyoto University [2017-97, 2018-105]
- [JP15H05477]
- [JP15K05513]
- [JP17K17937]
- [JP18H02048]
- [JP19K15651]
As one of the three primary colors, blue is significant for display and lighting applications and the development of blue-emitting molecules with high quantum efficiency, and color purity for organic light-emitting diodes (OLEDs) remains a key challenge. Herein, a new series of blue thermally activated delayed fluorescence (TADF) materials featuring pi-extended ladder-oxaborin and thiaborin acceptors has been developed. Steady-state and time-resolved photophysical measurements revealed the advantages of the ladder-oxaborin emitter, including a tiny singlet-triplet energy splitting of 10 meV, an ideal photoluminescence quantum yield of 100%, and an ultrashort TADF lifetime of 780 ns. The TADF-OLEDs incorporating the ladder-oxaborin (deep-blue) and thiaborin (sky-blue) emitters achieved significantly high external electroluminescence quantum efficiencies of up to 20.1% and 25.9%, respectively, accompanied by suppressed efficiency roll-offs.
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