期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 60, 期 28, 页码 15335-15339出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202104755
关键词
energy levels; energy transfer; organic electroluminescence; pure organic room-temperature phosphorescence; sensitization
资金
- National Natural Science Foundation of China [21935005]
- National Key R&D Programme of China [2020YFA0714601]
- Program for JLU Science and Technology Innovative Research Team [2019TD-33]
By combining different hosts, phosphorescent sensitizer, and fluorescent emitter, highly efficient OLEDs can be constructed with an external quantum efficiency (EQE) of 15.7%. This new strategy provides a new direction for the application of pure organic RTP materials in OLEDs.
Pure organic room-temperature phosphorescence (RTP) materials are considered as potential candidates for replacing precious metal complexes to fabricate highly efficient organic light-emitting devices (OLEDs). However, applications of the reported RTP materials in OLEDs are seriously impeded by their low photoluminescence quantum yields (PLQYs) in a thin film state. To overcome these obstacles, we established a new strategy to construct highly efficient OLEDs based on a pure organic RTP material sensitized fluorescence emitter by selecting benzimidazole-triazine molecules (PIM-TRZ), 2,6-di(phenothiazinyl)naphthalene (beta-DPTZN), and 5,6,11,12-tetraphenylnaphthacene (rubrene) as host, phosphor sensitizer, and fluorescent emitter, respectively. The perfect combination of host, phosphorescent sensitizer, and fluorescent emitter in the emitting layer ensure the outstanding performance of the devices with an external quantum efficiency (EQE) of 15.7 %.
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