期刊
NATIONAL SCIENCE REVIEW
卷 8, 期 2, 页码 -出版社
OXFORD UNIV PRESS
DOI: 10.1093/nsr/nwaa193
关键词
cerium complex; doublet emission; d-f transition; organic light-emitting diodes
资金
- National Key R&D Program of China [2017YFA0205100, 2016YFB0401001]
- National Natural Science Foundation of China [21621061]
- National Basic Research Program of China [2014CB643802]
- China Postdoctoral Science Foundation [2018M641065]
The blue emissive rare earth cerium(III) complex Ce-2 demonstrated high photoluminescence quantum yield and a short excited state lifetime, making it a promising candidate for efficient and stable blue OLEDs with significantly improved performance compared to typical phosphorescence or delayed fluorescence emitters.
In the field of RGB diodes, development of a blue organic light-emitting diode (OLED) is a challenge because of the lack of an emitter which simultaneously has a short excited state lifetime and a high theoretical external quantum efficiency (EQE). We demonstrate herein a blue emissive rare earth cerium(III) complex Ce-2 showing a high photoluminescence quantum yield of 95% and a short excited state lifetime of 52.0 ns in doped film, which is considerably faster than that achieved in typical efficient phosphorescence or thermally activated delayed fluorescence emitters (typical lifetimes>1 mu s). The corresponding OLED shows a maximum EQE up to 20.8% and a still high EQE of 18.2% at 1000 cdm(-2), as well as an operation lifetime 70 times longer than that of a classic phosphorescence OLED. The excellent performance indicates that cerium(III) complex could be a candidate for efficient and stable blue OLEDs because of its spin- and parity-allowed d-f transition from the Ce3+ ion.
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