Quantum dots enhanced stability of in-situ fabricated perovskite nanocrystals based light-emitting diodes:Electrical field distribution effects  

作　　者：Xulan Xue Menglin Li Zhenjie Liu Chenhui Wang Jincheng Xu Shuangpeng Wang Hanzhuang Zhang Haizheng Zhong Wenyu Ji 

机构地区：[1]Key Lab of Physics and Technology for Advanced Batteries(Ministry of Education),College of Physics,Jilin University,Changchun 130012,China [2]MIIT Key Laboratory for Low-Dimensional Quantum Structure and Devices,School of Materials Science&Engineering,Beijing Institute of Technology,Beijing 100081,China [3]Institute of Applied Physics and Materials Engineering,University of Macao,Taipa 999078,China

出　　处：《Fundamental Research》2025年第1期347-353,共7页自然科学基础研究(英文版)

基　　金：supported by the National Natural Science Foundation of China(11974141,12074148 and 61735004);M.L would like to thank the Introduction Project of International Postdoctoral Exchange Program of China(YJ20210234).

摘　　要：With the development in fabricating efficient perovskite light emitting diodes(PeLEDs),improving the operating stability becomes an urgent task.Here we report quantum dot(QD)enhanced stability of PeLEDs by introducing CdSe/ZnS core-shell QDs in toluene anti-solvent during in-situ fabrication of FAPbBr3 perovskite nanocrystals(PNCs)films.In comparison with PNC films with pristine toluene as the anti-solvent,the as-prepared FAPbBr3 PNC films with a QD monolayer on the surface exhibit improved photoluminescence quantum yield,enhanced photostability and better reproducibility.Benefiting from these advantages,the peak luminance and the maximum external quantum efficiency of the PeLED containing QD monolayer are increased from 6807 cd/m^(2)to 86,670 cd/m^(2)and 2.4%to 7.1%,respectively.The T50 lifetime under the initial luminance of 1021 cd/m^(2)approaches 83 minutes.Based on electrical field simulation and transient electroluminescence measurements,the enhanced stability can be mainly attributed to the electrical field redistribution induced by the QD monolayer.This work demonstrates that the combination of QDs and perovskites provides an effective strategy to address the operational stability of PeLEDs.The insights into electrical field distribution effect will make great impact on stability improvement of other perovskite based devices.

关 键 词：Perovskite nanocrystals Quantum dots Electrical field distribution Light-emitting diodes Operational stability 

分 类 号：TB3[一般工业技术—材料科学与工程]