期刊
ADVANCED MATERIALS
卷 32, 期 9, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201906614
关键词
exciplexes; operational stability; organic light-emitting diodes; thermally activated delayed fluorescence
类别
资金
- Japan Science and Technology Agency (JST), ERATO, Adachi Molecular Exciton Engineering Project
Exciplex system exhibiting thermally activated delayed fluorescence (TADF) holds a considerable potential to improve organic light-emitting diode (OLED) performances. However, the operational lifetime of current exciplex-based devices, unfortunately, falls far behind the requirement for commercialization. Herein, rationally choosing a TADF-type electron acceptor molecule is reported as a new strategy to enhance OLEDs' operating lifetime. A comprehensive study of the exciplex system containing 9,9 ',9 ''-triphenyl-9H,9 ' H,9 '' H-3,3 ':6 ',3 ''-tercarbazole (Tris-PCz) and triazine (TRZ) derivatives clarifies the relationship between unwanted carrier recombination on acceptor molecules, TADF property of acceptors, and the device degradation event. By employing a proposed exciton recycling strategy, a threefold increased operational lifetime can be achieved while still maintaining high-performance OLED properties. In particular, a stable blue OLED that employs this strategy is successfully demonstrated. This research provides an important step for exciplex-based devices toward the significant improvement of operational stability.
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