铝掺杂调控CsPbBr_(3)量子点尺寸实现单光子发射  

Size Control of CsPbBr_(3)Quantum Dots by Aluminum Doping Enabling Single-Photon Emission

作　　者：吕鑫 李国辉[1] 郭婷[2] 刘绍鼎[1] 孙虹[1] 崔艳霞[1] 温荣 LüXin;Li Guohui;Guo Ting;Liu Shaoding;Sun Hong;Cui Yanxia;Wen Rong(College of Information Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,Shanxi,China;College of Physics,Taiyuan University of Technology,Taiyuan 030024,Shanxi,China)

机构地区：[1]太原理工大学电子信息与光学工程学院,山西太原030024 [2]太原理工大学物理学院,山西太原030024

出　　处：《光学学报》2024年第16期347-356,共10页Acta Optica Sinica

基　　金：国家自然科学基金(12104334,U21A20496,61922060);山西省重点研发计划(202102150101007);山西浙大新材料与化工研究院研发项目(2021SX-FR008,2022SX-TD020);中央引导地方科技发展资金项目(YDZJSX20231A010,YDZJSX2021A012);山西省自然科学基金(20210302123154,20210302123169,202203021222102);山西省回国留学人员科研资助项目(2021-033)。

摘　　要：采用热注入法合成了具有不同Al^(3+)离子掺杂浓度的铯铅溴(CsPbBr_(3))量子点,并系统地研究了它们的光学特性和材料特性。研究结果表明,Al^(3+)离子掺杂不仅能够有效调控CsPbBr_(3)量子点的发光强度与发光波长,还增强了CsPbBr_(3)量子点中的Pb—Br键的相互作用,从而显著提高了量子点的环境稳定性。此外,Al^(3+)离子的半径远小于Pb^(2+)离子,导致Al^(3+)离子掺杂能够有效引起CsPbBr_(3)量子点晶格收缩,进而减小了量子点的尺寸并提高了尺寸均一性。CsPbBr_(3)量子点尺寸的减小增强了其量子限域效应,使得量子点的单光子发射性能得到了显著提高。本研究为优化钙钛矿量子点单光子源性能提供了新思路,也促进了新兴钙钛矿单光子源领域的发展。Objective In quantum communication,achieving efficient transmission and long-distance communication relies on an ideal single-photon source.CsPbBr_(3)quantum dots hold significant promise as single-photon sources due to their high probability of single-photon emission.Among the methods to enhance CsPbBr_(3)quantum dots'single-photon performance,size reduction is crucial.In this study,we synthesize CsPbBr_(3)quantum dots doped with varying concentrations of Al^(3+)ions using a thermal injection method and systematically investigate their optical and material properties.The results demonstrate that Al^(3+)ion doping effectively modulates the emission intensity and wavelength of CsPbBr_(3)quantum dots while enhancing the interaction of Pb—Br bonds,thus significantly improving their environmental stability.Moreover,by leveraging the smaller ionic radius of Al^(3+)ions compared to Pb^(2+)ions,Al^(3+)ion doping effectively induces lattice contraction in CsPbBr_(3)quantum dots,leading to reduced size and enhanced size uniformity.Consequently,the reduced size enhances the quantum confinement effect,significantly improving single-photon emission performance.This study presents new strategies for optimizing perovskite quantum dot single-photon sources,advancing the development of perovskite single-photon sources.Methods We utilize a hot injection method to synthesize CsPbBr_(3)quantum dots and Al^(3+)-doped CsPbBr_(3)quantum dots,ensuring high crystallinity and superior size uniformity.The method involves two steps.First,a mixture of cesium carbonate,oleic acid,and octadecene is heated for 2 h in an inert environment.To enhance the synthesis quality of quantum dots,an excess of oleic acid is added,resulting in a cesium oleate precursor that is soluble at room temperature.Second,a mixture of lead bromide,aluminum bromide,oleic acid,oleylamine,and octadecene is heated for 2 h in an inert environment.This is followed by the rapid injection of 0.4 mL of cesium oleate precursor.After allowing the reaction to proceed for 5 s,i

关 键 词：钙钛矿量子点 热注入法 离子掺杂 单光子 

分 类 号：O436[机械工程—光学工程]