期刊
CHEMICAL COMMUNICATIONS
卷 55, 期 24, 页码 3501-3504出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9cc00230h
关键词
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资金
- Natural Science Foundation of China [11564026, 11774141]
- Natural Science Foundation of Jiangxi Province [20171BCB23051, 20171BCB23052, 20171BAB202036, 20181BAB201016]
- Science and Technology Planning Project of Guangdong Province [2016A040403124]
- Science and Technology Planning Project of Zhanjiang City, Guangdong Province [2017A02024]
The development of blue quantum dot light-emitting diodes (QLEDs) lags far behind that of the red and green ones, which hinders the practical commercialization of QLEDs. Balancing the charge transfer still remains a challenging task, because blue QD emitters have a deeper valence band (VB) that creates a great injection barrier impeding the hole transfer. Herein, we demonstrate that the charge transfer balance can be improved by using a tert-butyldimethylsilyl chloride-modified poly(p-phenylene benzobisoxazole) (TBS-PBO) blocking layer. The TBS-PBO acts well in blocking excess electron injection and preserving the emission efficiency of the QD emitter. Compared to the insulating blocking layers, TBS-PBO has good conductivity, thus keeping the current density at a high level. Our device delivers a notable luminance of 4635 cd m(-2) at an external quantum efficiency (EQE) maximum of 17.4%. To the best of our knowledge, the luminance with EQE > 17% is the highest one to be reported for blue QLEDs.
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