期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 60, 期 17, 页码 9598-9603出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202100423
关键词
donor-acceptor systems; doping; fluorescence; OLEDs; spiro compounds
资金
- National Natural Science Foundation of China [51773079, 51603082, 21935005]
This study presents a molecular design strategy for efficient deep-blue organic light-emitting diodes (OLEDs) with desirable CIEy color coordinates, achieving high quantum efficiencies and meeting display requirements.
Reported herein is a molecular design strategy of deep-blue emitters for resolving the lack of highly efficient deep-blue organic light-emitting diodes (OLEDs) featuring CIEy (Commission Internationale de l'Eclairage) color coordinates matching the display requirements (<0.1). The strategy is to combine weak spiro-donor and spiro-acceptor groups into a linear donor-pi-acceptor type of thermally-activated delayed fluorescence molecule through a sterically bulky pi-spacer. The strategy endows an emitter with deep-blue emission, a narrower emission bandwidth (51 nm in toluene), a high photoluminescence quantum yield (0.95 in toluene), weak concentration quenching, and efficient triplet-exciton utilization, which are all attractive characteristics for emitters of deep-blue OLEDs with lower CIEy coordinates. Owing to the rational design, the emitter has realized not only highly efficient doped deep-blue OLEDs with external quantum efficiencies (EQEs) up to 25.4 % and CIEy less than 0.1 but also so far the most efficient nondoped deep-blue OLED (EQE up to 22.5 %) with CIEy less than 0.1.
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