期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 57, 期 35, 页码 11316-11320出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201806323
关键词
N,N compounds; carbazoles; full width at half maximum; organic light-emitting diodes; thermally activated delayed fluorescence
资金
- National Natural Science Foundation of China [51773088, 21631006]
- National Key R&D Program of China [2018YFA0306004]
- Pakistan Science Foundation Collaborative research project [5161101159]
Multi-resonance induced by boron and nitrogen atoms in opposite resonance positions endows a thermally activated delayed fluorescence (MR-TADF) emitter with a strikingly small full width at half maximum of only 26nm and excellent photoluminescence quantum yield of up to 97.48%. The introduction of a carbazole unit in the para position of the B-substituted phenyl-ring can significantly boost up the resonance effect without compromising the color fidelity, subsequently enhancing the performances of the corresponding pure blue TADF-OLED, with an outstanding external quantum efficiency (EQE) up to 32.1% and low efficiency roll-off, making it one of the best TADF-OLEDs in the blue region to date. Furthermore, utilizing this material as host for a yellow phosphorescent emitter, the device also shows a significantly reduced turn-on voltage of 3.2V and an EQE(max) of 22.2%.
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