期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 27, 期 55, 页码 13828-13839出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.202102136
关键词
benzothiadiazole; efficiency roll-off; organic light-emitting diodes; phenanthroimidazole; triplet-triplet fusion
资金
- National Natural Science Foundation of China [51972171, 11804156]
- Zhejiang Postdoctoral Foundation [ZJ2020009]
This study presents highly emissive organic fluorescent molecules based on phenanthroimidazole-benzothiadiazole derivatives, capable of maintaining high external quantum efficiency at high luminance through triplet-triplet fusion.
Achieving high efficiency at high luminance is one of the most important prerequisites towards practical application of any kind of light-emitting diode (LED). Herein, we report highly emissive organic fluorescent molecules based on phenanthroimidazole-benzothiadiazole derivatives capable of maintaining high external quantum efficiency (EQE) at high luminance enabled by triplet-triplet fusion (TTF) in doped organic LEDs. The PIBzP-, PIBzPCN-, and PIBzTPA-based devices showed EQEs of 8.27, 9.15, and 8.64 %, respectively, at luminance of higher than 1000 cd m(-2), with little efficiency roll-off.
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