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Highly Efficient Electrofluorescence Material Based on Pure Organic Phosphor Sensitization **
Author(s) -
Wang Jiaxuan,
Liang Baoyan,
Wei Jinbei,
Li Zhiqiang,
Xu Yincai,
Yang Tong,
Li Chenglong,
Wang Yue
Publication year - 2021
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202104755
Subject(s) - oled , phosphorescence , common emitter , phosphor , materials science , photoluminescence , fluorescence , optoelectronics , quantum efficiency , rubrene , benzimidazole , phosphorescent organic light emitting diode , nanotechnology , layer (electronics) , chemistry , optics , organic chemistry , physics
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 (β‐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 %.