摘要
采用氯化锌(ZnCl_(2))修饰镉基CdSe/ZnS蓝光量子点(B-QD)薄膜,发现与量子点表面结合力更强的ZnCl_(2)能够部分取代量子点长链配体油酸,有效钝化量子点表面缺陷,提高薄膜的荧光量子效率(PLQY)。此外,由于ZnCl_(2)具有偶极作用,使量子点真空能级提高0.2 eV,一方面可改善电子和空穴载流子注入平衡,另一方面可有效降低发光器件的启亮电压,提高器件的发光寿命。这种无机配体修饰量子点薄膜的方法可能为解决蓝光量子点发光二极管(B-QLEDs)因空穴注入困难和量子点表面缺陷导致器件性能不高的问题提供一个有效思路。
Inorganic zinc chloride(ZnCl_(2))was used as a ligand to modify cadmium-based blue quantum dot(B-QD)film.In this case,ZnCl_(2) can partially replace the original long-chain ligand of oleic acid(OA)because of a strong interaction between ZnCl_(2) and QDs.The replaced ZnCl_(2) can passivate the surface defects of QDs to enhance the photoluminescence quantum yield(PLQY)of the QDs film.Meanwhile,the strategy can significantly improve carrier transport capacity and pull up the vacuum energy level of the QDs film by 0.2 eV due to ZnCl2 dipoles,which may improve electron and hole injection balance,reduce the turn-on voltage of EL devices,and extend device lifetime as well.This method might provide an effective way to improve performances of blue quantum dot light-emitting diodes.
作者
张玉玲
肖毅
王俊杰
罗宇
郭标
李丹阳
许伟
彭俊彪
ZHANG Yu-ling;XIAO Yi;WANG Jun-jie;LUO Yu;GUO Biao;LI Dan-yang;XU Wei;PENG Jun-biao(State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510641, Guangdong)
出处
《发光学报》
EI
CAS
CSCD
北大核心
2022年第2期238-246,共9页
Chinese Journal of Luminescence
基金
国家自然科学基金(51521002,62074059,52073104)
广东省科技计划(2019B030302007,2019B010934001)资助项目。
关键词
氯化锌修饰层
无机配体取代
蓝光量子点发光二极管
载流子平衡
效率滚降减缓
zinc chloride modification
inorganic ligand exchange
blue quantum dot light-emitting diodes
balanced carriers
efficiency roll-off improvement
