Mn掺杂CsPbCl_(x)Br_(3-x)@Cs_(4)PbCl_(6)核/壳结构钙钛矿纳米晶的制备及白光LED性能研究  

Preparation of manganese doped CsPbCl_(x)Br_(3-x)@Cs_(4)PbCl_(6) core/shell perovskite nanocrystals for white LED

作　　者：季思航 陈子航 袁曦[1,2] 华杰 张永玲[2] JI Sihang;CHEN Zihang;YUAN Xi;HUA Jie;ZHANG Yongling(Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education,Jilin Normal University,Changchun 130103,China;College of Information Technology,Jilin Normal University,Siping 136000,Jilin Province,China)

机构地区：[1]吉林师范大学功能材料物理与化学教育部重点实验室,吉林长春130103 [2]吉林师范大学信息技术学院,吉林四平136000

出　　处：《电子元件与材料》2023年第4期387-394,共8页Electronic Components And Materials

基　　金：吉林省科技发展计划项目(20210101161JC);吉林省教育厅科学技术研究项目(JJKH20210454KJ)。

摘　　要：无机铅卤钙钛矿纳米晶(NCs)具有量子产率高、可调峰位、色域宽、阈值低等优点,被广泛应用到固态照明、光电转换和光电探测领域。但铅卤钙钛矿是离子晶体,离子迁移导致该材料在光热或极性溶剂环境时产生不可逆的降解,严重阻碍了钙钛矿纳米晶的实际应用。近年来,金属离子掺杂和纳米晶表面壳层包覆成为改善钙钛矿材料光电性能和提高稳定性的主要手段。通过热注入和阴离子交换策略成功制备了双光发射的Mn∶CsPbCl_(x)Br_(3-x)纳米晶,并在室温下表面自组装生长Cs_(4)PbCl_(6)壳层。Cs_(4)PbCl_(6)的包覆改善了纳米晶的光学性能和稳定性,Mn^(2+)的荧光量子产率和发光寿命分别提高到48%和0.62 ms。利用绿色CsPbBr_(3)@Cs_(4)PbBr_(6)与蓝橙双色Mn∶CsPbCl_(x)Br_(3-x)@Cs_(4)PbCl_(6)核/壳纳米晶制备了光稳定性较好的白光二极管(WLED),为未来优化器件性能提供了新思路。Inorganic lead halide perovskite nanocrystals have been widely used in solid-state lighting,photoelectric conversion and photoelectric detection due to their high quantum yield,tunable peak wavelength,wide color gamut and low threshold.However,lead halide perovskite is an ionic crystal,and ion migration could lead to irreversible degradation of the material in the photothermal or polar solvent environment,which seriously hinders its practical application.In recent years,metal ion doping and nanocrystal surface coating have become the main means to improve the optoelectronic properties and enhance its stability.Here,the Mn∶CsPbCl_(x)Br_(3-x) nanocrystals with dual-emission were successfully prepared by hot injection and anion exchange strategies,and Cs_(4) PbCl_(6) shells were assembled on the surface at room temperature.The Cs_(4)PbCl_(6) coating improved the optical properties and stability of the nanocrystals,and the photoluminescence quantum yield(PLQY)and PL lifetime of Mn^(2+)was increased to 48% and 0.69 ms respectively.The white light diodes(WLEDs)can be constructed by green CsPbBr_(3)@Cs_(4) PbBr_(6) and blue-orange dual-color Mn∶CsPbCl_(x)Br_(3-x)@Cs_(4)PbCl_(6) core/shell nanocrystals,which provides a new idea for optimizing device performance in the future.

关 键 词：铅卤钙钛矿 MN掺杂 纳米晶 发光性质 白光二极管 

分 类 号：TB383.1[一般工业技术—材料科学与工程]