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Blue Quantum Dot Light-Emitting Diodes With High Luminance by Improving the Charge Transfer Balance

Blue Quantum Dot Light-Emitting Diodes With High Luminance by Improving the Charge Transfer Balance

Dongyu Li, Jinke Bai, Tingting Zhang, Chun Chang, Xiao Jin, Zhen Huang, Bing Xu, Qinghua Li

Chem Commun (Camb). 2019 Mar 19;55(24):3501-3504.

PMID: 30838368

Abstract:

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.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP18162486	tert-Butyldimethylsilyl chloride		18162-48-6	Price

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