LiCl掺杂PEDOT∶PSS提高蓝光量子点发光二极管的性能  

Performance enhancement of blue quantum dot light-emitting diodes via LiCl doped PEDOT∶PSS

作　　者：王艳林 曹松 余春燕[1,2] 周利通 翟光美[1,2] WANG Yanlin;CAO Song;YU Chunyan;ZHOU Litong;ZHAI Guangmei(Key Laboratory of Interface Science and Engineering in Advanced Materials,Ministry of Education,Taiyuan University of Technology,Taiyuan 030024,China;College of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学新材料界面科学与工程教育部重点实验室,山西太原030024 [2]太原理工大学材料科学与工程学院,山西太原030024

出　　处：《液晶与显示》2024年第6期771-780,共10页Chinese Journal of Liquid Crystals and Displays

基　　金：山西省基础研究计划(No.202103021224055);山西省回国留学人员科研资助项目(No.2023-040)。

摘　　要：基于全溶液制备的量子点发光二极管(QLEDs)通常存在电子-空穴注入不平衡的问题,严重地限制了蓝光QLEDs器件性能的提升。本文研究了不同浓度的金属卤化物(Li Cl)掺杂对聚(乙烯二氧噻吩)∶聚苯乙烯磺酸盐(PEDOT∶PSS)薄膜的形貌、导电率、透光性以及所制备QLEDs器件性能的影响规律。实验结果表明,Li Cl的掺杂浓度(质量分数)为2%时蓝光QLED器件性能的提升效果最佳,这主要归因于Li Cl掺杂后的PEDOT∶PSS薄膜导电率和透光性的增强以及器件中空穴注入效率的提高。相较于未掺杂的PEDOT∶PSS基QLED器件,基于Li Cl掺杂的蓝光QLED器件的最大亮度、峰值电流效率、峰值功率效率和峰值外量子效率分别从5 083 cd·m^(-2)、0.91 cd·A^(-1)、0.59 lm·W^(-1)和2.31%提升到7 451 cd·m^(-2)、1.38 cd·A^(-1)、0.89 lm·W^(-1)和3.51%。结果表明,采用Li Cl掺杂PEDOT∶PSS空穴注入层是提高蓝光QLED性能的一种有效策略。Full solution-processed quantum dot light-emitting diodes(QLEDs)typically suffer from the problem of electron-hole injection imbalance,which severely limits the performance improvement of blue QLEDs devices.The effects of metal halide(LiCl)doping on the morphology,conductivity and light transmittance of poly(ethylenedioxythiophene)∶polystyrene sulfonate(PEDOT∶PSS)films and the device performance of the prepared QLEDs were investigated.The experimental results show that the best effect on the enhancement of blue QLED device performance is achieved when the doping concentration of LiCl is 2%(mass fraction),which is mainly attributed to the enhancement of conductivity and transmittance of LiCl-doped PEDOT∶PSS films as well as the improvement of hole injection efficiency in the devices.Compared with the undoped PEDOT∶PSS-based QLED devices,the maximum brightness,current efficiency,power efficiency and external quantum efficiency of the LiCl-doped blue QLED devices are increased to 7451 cd·m^(-2),1.38 cd·A^(-1),0.89 lm·W^(-1) and 3.51%from 5083 cd·m^(-2),0.91 cd·A^(-1),0.59 lm·W^(-1) and 2.31%,respectively.The results show that the use of LiCl-doped PEDOT∶PSS hole injection layer is an effective strategy to improve the performance of blue QLEDs.

关 键 词：蓝光量子点发光二极管 PEDOT∶PSS LiCl掺杂 空穴注入层 空穴注入 

分 类 号：TN383.1[电子电信—物理电子学]