CsPbI3量子点在不同极性溶剂的光学特性  

Optical properties of CsPbI3 quantum dots in different polar solvents

作　　者：孙春雨 李婧[1] 王新占[1] 郭成锁 于威[1] SUN Chunyu;LI Jing;WANG Xinzhan;GUO Chengsuo;YU We(College of Physics Science and Technology,Hebei University,Baoding 071002,China)

机构地区：[1]河北大学物理科学与技术学院,河北保定071002

出　　处：《河北大学学报（自然科学版）》2020年第6期585-590,共6页Journal of Hebei University(Natural Science Edition)

基　　金：国家重点研究发展计划项目(2018YFB1500503-02);河北省自然科学基金资助项目(F2017201101)。

摘　　要：全无机钙钛矿CsPbI3量子点具有发射谱线窄、荧光量子产率高和稳定性强等特点,在红光LEDs和新型太阳电池领域具有广阔的应用前景.本文通过热注入法在正己烷溶剂中合成了CsPbI3量子点,并对其结构和光学特性进行表征,结果表明,量子点主要的发光机制是量子限制区自由激子复合.通过改变溶剂的种类(正己烷、甲苯、乙酸乙酯、乙酸甲酯)对量子点的光学特性进行了调整,研究发现随着溶剂极性的增加,发光峰位从615nm红移至660nm,这是因为极性溶剂对量子点表面具有修饰作用,通过改变溶液极性实现CsPbI3量子点发光峰位调节的条件为制备波长可调的光电器件提供了一定的实验参考.All-inorganic perovskite CsPbI3 quantum dots have the characteristics of narrow emission spectrum lines,high fluorescence quantum yield,and strong stability.They have broad application prospects in the fields of red LEDs and new solar cells.In this paper,CsPbI3 quantum dots were synthesized in n-hexane solvent by hot injection method,and their structure and optical characteristics were characterized.The results show that the main light-emitting mechanism of quantum dots is free exciton recombination in the weak quantum confinement region.The optical properties of the quantum dots were adjusted by changing the type of solvent(n-hexane,toluene,ethyl acetate,methyl acetate).It was found that the luminescence peak position shifted from 615 to 660 nm as the polarity of the solvent increased.This is because the polar solvent has a modification effect on the surface of the quantum dots,and the conditions for adjusting the emission peak position of CsPbI3 quantum dots by changing the polarity of the solution provide an experimental reference for the preparation of wavelength-tunable photovoltaic devices.

关 键 词：CsPbI3 极性溶剂 表面修饰 发光二极管 

分 类 号：O469[理学—凝聚态物理]