Journal
OPTICAL MATERIALS
Volume 121, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.optmat.2021.111582
Keywords
Pyrene; Imidazole; Thermal-stability; Deep-blue; Organic light-emitting devices
Categories
Funding
- National Natural Science Foundation of China [21574144, 51273209, 51411140244]
- Zhejiang Provincial Natural Science Foundation of China [LR16B040002]
- CAS Interdisciplinary Innovation Team
- Ningbo Municipal Science and Technology Innovative Research Team [2015B11002, 2016B10005]
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A new deep-blue light-emitting material, TPA-PyI, is developed for OLEDs by merging different unit structures, exhibiting good emission performance and thermal stability.
Numerous endeavors have been exerted to devise deep-blue light-emitting materials (LEMs) for organic light-emitting devices (OLEDs). Nevertheless, deep-blue light-emitting materials exhibiting high efficiency for simple-structured OLEDs are still scarce. Herein, a donor-acceptor based LEM, 4'-(4, 5-diphenyl-1-(3-(pyren-1-yl) phenyl)-1H-imidazole-2-yl)-N,N-diphenylbiphenyl-4-amine (TPA-PyI) is developed by merging imidazole, triphenyl-amine and pyrene units for OLEDs. TPA-PyI is used as the emitting layer in OLED device, which emits a deep-blue fluorescence at 444 nm. With a current efficiency (CE) of 3.05 cd/A and a power efficiency (PE) of 2.95 lm/W, an EQE of 2.97% is achieved. High thermal-stability is achieved with decomposition-temperature (T-d) of 516 degrees C.
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