期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 123, 期 1, 页码 227-232出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.8b10599
关键词
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资金
- National Natural Science Foundation of China [11804033, 11747043, 11747039]
- Advanced Research Projects of Chongqing Municipal Science and Technology Commission [cstc2017jcy-jA1630]
- Science and Technology Research Program of Chongqing Municipal Education Commission [KJ1712310]
- Natural Science Foundation of Jiangsu Province [BK20160440]
- Projects of Fuling District Science and Technology Commission (FLKW) [2017ABA1015]
Bis[2-(4,6-difluorophenyl)pyridyl-N,C2']iridium(III) picolinate (Flrpic) is the most widely used blue phosphorescent material for PhOLEDs, but its stability is generally considered insufficient for practical applications. To understand its insufficient stability further, we evaluated the degradation mechanism of Flrpic isomers in different electronic states (i.e., ground, anion, cation, lowest singlet, and triplet excited states). We developed a theoretical method to identify the degradation lifetime of Flrpic in PhOLEDs. Finally, we found that the extremely short lifetime of Flrpic-based PhOLEDs is mainly caused by two of its four isomers, while one of its other isomers exhibited high stability. Our findings demonstrated that not all Flrpic isomers are unstable for the development of long-lifetime PhOLEDs. We propose to achieve the practical application of highly efficient and long-lifetime blue PhOLEDs by isolating the high-stability isomer of Flrpic from the others. This will accelerate the application of PhOLEDs in the field of display and white-light illumination.
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