期刊
CHEMISTRY-AN ASIAN JOURNAL
卷 13, 期 9, 页码 1187-1191出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/asia.201800173
关键词
donor-acceptor systems; electrochemistry; organic light-emitting diodes; structure-activity relationships; thermally activated delayed fluorescence
资金
- National Key R&D Program of China [2017YFE0106000, 2016YFB0401000]
- National Natural Science Foundation of China [51773212, 21574144, 21674123]
- China Postdoctoral Science Foundation [2017M621987]
- Zhejiang Provincial Natural Science Foundation of China [LR16B040002]
- Ningbo Municipal Science and Technology Innovative Research Team [2015B11002, 2016B10005]
- CAS Interdisciplinary Innovation Team
- CAS Key Project of Frontier Science Research [QYZDB-SSW-SYS030]
- CAS Key Project of International Cooperation [174433KYSB20160065]
Thermally activated delayed fluorescent (TADF) emitters are usually designed as donor-acceptor structures with large dihedral angles, which tend to incur low fluorescent efficiency, and therefore, through molecular design various strategies have been proposed to increase the efficiency of emitters; however, few studies have compared these strategies in one TADF system. In this study, a novel TADF molecule, [4-(9,9-diphenylacridin-10-yl)phenyl](phenyl)methanone (BP-DPAC), was designed as a prototype, and two derivatives, BP-Ph-DPAC and DPAC-BP-DPAC, were also prepared to represent two common approaches to enhance TADF performance. Compared with the maximum external quantum efficiency (EQE) of 6.82% for BP-DPAC, organic light-emitting diodes (OLED) devices based on DPAC-BP-DPAC exhibited enhanced TADF properties with the highest maximum EQE of 18.67%, owing to an additional diphenylacridine donor, whereas BP-Ph-DPAC showed non-TADF properties and exhibited the lowest EQE of 4.25%, owing to the insertion of a phenyl ring between donor and acceptor.
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