钾离子掺杂CsPbCl_(3)∶Mn钙钛矿量子点的荧光性能  

Fluorescence properties of potassium ions doped CsPbCl_(3)∶Mn perovskite quantum dots

作　　者：常鹏 翟玥 吴娜 张宏 邾强强 王乐 CHANG Peng;ZHAI Yue;WU Na;ZHANG Hong;ZHU Qiang-qiang;WANG Le(College of Optical and Electronic Technology, China Jiliang University, Hangzhou 310018, China)

机构地区：[1]中国计量大学光学与电子科技学院,浙江杭州310018

出　　处：《液晶与显示》2021年第10期1352-1361,共10页Chinese Journal of Liquid Crystals and Displays

基　　金：浙江省杰出青年基金(No.LR19F050001);国家自然科学基金(No.62075203,No.51832005,No.51702339)。

摘　　要：锰(Mn^(2+))离子掺杂的全无机CsPbCl_(3)钙钛矿量子点具有独特的光学特性和纳米级颗粒尺寸,在Mini/Micro-LED显示器件中具有巨大的应用潜力。然而,当前CsPbCl_(3)∶Mn^(2+)钙钛矿量子点的荧光量子效率较低,无法满足实际应用需求。针对此问题,本文采用热注入法制备了钾(K^(+))离子和Mn^(2+)离子共掺杂的CsPbCl_(3)钙钛矿量子点,合成的CsPbCl_(3)∶(K^(+),Mn^(2+))钙钛矿量子点具有双光发射特性,其发光主要来源于钙钛矿激子和掺杂的Mn^(2+)离子。通过优化K^(+)离子的掺杂浓度,CsPbCl_(3)∶(K^(+),Mn^(2+))钙钛矿量子点的荧光量子效率从原始的16.5%提高到66.2%。同时研究了K^(+)离子掺杂对CsPbCl_(3)∶Mn^(2+)钙钛矿量子点荧光性能的调控机制。研究结果表明,K^(+)离子的掺杂能够有效抑制CsPbCl_(3)∶(K^(+),Mn^(2+))钙钛矿量子点中本征缺陷态以及Mn-Mn二聚体或Mn相关缺陷态,进而增强了量子点中载流子的辐射复合发光。得益于异质离子掺杂的调控策略,此类掺杂型钙钛矿量子点有望应用于Mini/Micro-LED显示领域。Manganese(Mn^(2+))ion-doped all-inorganic CsPbCl_(3) perovskite quantum dots have shown great potential for application in Mini/Micro-LED display devices due to their unique photoluminescence properties and nano-scale particle size.However,the current photoluminescence quantum yields of CsPbCl_(3)∶Mn^(2+)perovskite quantum dots is low and cannot meet the needs of practical applications.Herein,the potassium(K^(+))and Mn^(2+)ions co-doped CsPbCl_(3) perovskite quantum dots are synthesized via the hot injection method.The prepared CsPbCl_(3)∶(K^(+),Mn^(2+))perovskite quantum dots present a dual-color emission,which can be assigned to the perovskite excitons emission and Mn^(2+)ions emission.The photoluminescence quantum yield of CsPbCl_(3)∶(K^(+),Mn^(2+))perovskite quantum dots is improved from 16.5%of original to 66.2%through the optimization of K^(+)ions doping concentration.Meanwhile,the regulation mechanism of K^(+)ions doping on the photoluminescence properties of CsPbCl_(3)∶Mn^(2+)perovskite quantum dots are investigated.It is shown that the incorporation of K^(+)ions can effectively inhibit the formation of intrinsic defect states and Mn-Mn dimers or Mn-related defects in CsPbCl_(3)∶(K^(+),Mn^(2+))perovskite quantum dots,thus enhancing the radiative recombination luminescence of carriers in perovskite quantum dots.Benefiting from the strategy of hetero-ions doping,these doped perovskite quantum dots are expected to be applied in Mini/Micro-LED display fields.

关 键 词：CsPbCl_(3)∶Mn^(2+)钙钛矿量子点 K+离子掺杂 双光发射 荧光量子效率 

分 类 号：O482.31[理学—固体物理]