摘要
在量子点发光二极管(QLED)中,电子-空穴注入不平衡和量子点层/电子传输层间界面的荧光猝灭限制着QLED效率的提升。基于此,采用金属卤化物(ZnCl_(2))原位处理电子传输层方法来减少氧化锌(ZnO)电子传输层的氧空位,同时有效钝化其表面不饱和键,因此在一定程度上实现抑制量子点/电子传输层界面的荧光猝灭和提高QLED中的电子-空穴注入平衡的目的,最终得到了高亮度、高效率的QLED。原位钝化处理后的ZnO基QLED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(EQE)分别从未处理QLED的176800 cd/m^(2)、9.86 cd/A、8.38 lm/W和7.42%提高到219200 cd/m^(2)、15.14 cd/A、12.66 lm/W和11.65%。结果表明,ZnCl_(2)原位钝化ZnO电子传输层对QLED性能的提升起到重要的作用。
In quantum dot light-emitting diodes(QLEDs),the imbalance of electron-hole injection and the fluorescence quenching at the interface between the quantum dot layer and the electron transport layer limit the improvement of QLED efficiency.Based on this,an in-situ treatment method with metal halide(ZnCl_(2))was adopted to reduce the oxygen vacancies in the zinc oxide(ZnO)electron transport layer while effectively passivating unsaturated bonds on its surface.As a result,the fluorescence quenching at the interface between the quantum dot layer and the electron transport layer is suppressed,and the balance of electron-hole injection in QLEDs is improved to a certain extent.Ultimately,QLEDs with high brightness and high efficiency were obtained.The maximum luminance,peak current efficiency,peak power efficiency,and peak external quantum efficiency of ZnO-based QLEDs after in-situ passivation treatment with ZnCl_(2)are increased from 176800 cd/m^(2),9.86 cd/A,8.38 lm/W,and 7.42%of untreated QLEDs to 219200 cd/m^(2),15.14 cd/A,12.66 lm/W,and 11.65%,respectively.The results show that ZnCl_(2)in-situ passivation of ZnO electron transport layer plays an important role in improving the performances of QLEDs.
作者
王北恒
高懿韦
王艳林
曹松
余春燕
翟光美
Wang Beiheng;Gao Yiwei;Wang Yanlin;Cao Song;Yu Chunyan;Zhai Guangmei(Key Laboratory of Interface Science and Engineering in Advanced Materials of Ministry of Education,Taiyuan University of Technology,Taiyuan 030024,China;College of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China)
出处
《微纳电子技术》
CAS
北大核心
2023年第12期1928-1936,共9页
Micronanoelectronic Technology
基金
山西省基础研究计划项目(202103021224055)。
