Pure-blue emissive ZnSe/Cd_(x)Zn_(1-x)S/ZnS quantum dots with type-II core-shell structure for display application  

作　　者：Mingrui Liu Chenhui Wang Peng Huang Jinhua He Muhammad Ramzan Haizheng Zhong 

机构地区：[1]MIIT Key Laboratory for Low-Dimensional Quantum Structure and Devices,School of Materials Science and Engineering,Beijing Institute of Technology,Beijing 100081,China [2]Beijing Engineering Research Center for Mixed Reality and Advanced Display Technology,School of Optics and Photonics,Beijing Institute of Technology,Beijing 100081,China

出　　处：《Nano Research》2024年第12期10476-10482,共7页纳米研究（英文版）

基　　金：granted by National Natural Science Foundation of China(No.U23B20683);the Natural Science Foundation of Beijing Municipality(No.Z210018).

摘　　要：Blue emissive quantum dots are key materials in fabricating quantum-dot light-emitting diodes for display applications.Up to date,most of the previous blue emissive quantum dots are based on quantum dots with type-I core-shell structure.In this work,we report pure-blue emissive ZnSe/Cd_(x)Zn_(1-x)S/ZnS quantum dots with type-II core-shell structure,which show high photoluminescence quantum yield over 90%.The type-II structure was investigated by applying time-resolved photoluminescence and transient absorption measurements,illustrating the extended photoluminescence decay lifetime of ZnSe/Cd_(x)Zn_(1-x)S quantum dots as well as the transition of bleaching peak from the valence band of ZnSe to the conduction band of CdZnS.We further fabricated ZnSe/Cd_(x)Zn_(1-x)S/ZnS quantum dots based electroluminescence devices,achieving a maximum external quantum efficiency of 6.7%and a maximum luminance of 39,766 cd·m^(-2).

关 键 词：quantum dots blue emitter TYPE-II DISPLAY core shell 

分 类 号：TN31[电子电信—物理电子学]