Temperature-dependent photoluminescence of size-tunable ZnAgInSe quaternary quantum dots  

作　　者：丁琪 张晓松 李岚 徐建萍 周平 董晓菲 晏明 

机构地区：[1]Institute of Material Physics,Key Laboratory of Display Materials and Photoelectric Devices,Ministry of Education,Tianjin University of Technology [2]School of Engineering and Applied Sciences,Harvard University

出　　处：《Chinese Physics B》2017年第6期437-443,共7页中国物理B（英文版）

基　　金：supported by the National High Technology Research and Development Program of China(Grant No.2013AA014201);the National Key Foundation for Exploring Scientific Instrument of China(Grant No.2014YQ120351);the Natural Science Foundation of Tianjin(Grant No.11JCYBJC00300,4JCZDJC31200,15JCYBJC16700,and 15JCYBJC16800)

摘　　要：Colloidal ZnAgInSe（ZAISe） quantum dots（QDs） with different particle sizes were obtained by accommodating the reaction time. In the previous research, photoluminescence（PL） of ZAISe QDs only could be tuned by changing the composition. In this work the size-tunable photoluminescence was observed successfully. The red shift in the photoluminescence spectra was caused by the quantum confinement effect. The time-resolved photoluminescence indicated that the luminescence mechanisms of the ZAISe QDs were contributed by three recombination processes. Furthermore, the temperature-dependent PL spectra were investigated. We verified the regular change of temperature-dependent PL intensity, peak energy, and the emission linewidth of broadening for ZAISe QDs. According to these fitting data, the activation energy（？E） of ZAISe QDs with different nanocrystal sizes was obtained and the stability of luminescence was discussed.Colloidal ZnAgInSe（ZAISe） quantum dots（QDs） with different particle sizes were obtained by accommodating the reaction time. In the previous research, photoluminescence（PL） of ZAISe QDs only could be tuned by changing the composition. In this work the size-tunable photoluminescence was observed successfully. The red shift in the photoluminescence spectra was caused by the quantum confinement effect. The time-resolved photoluminescence indicated that the luminescence mechanisms of the ZAISe QDs were contributed by three recombination processes. Furthermore, the temperature-dependent PL spectra were investigated. We verified the regular change of temperature-dependent PL intensity, peak energy, and the emission linewidth of broadening for ZAISe QDs. According to these fitting data, the activation energy（？E） of ZAISe QDs with different nanocrystal sizes was obtained and the stability of luminescence was discussed.

关 键 词：quaternary quantum dots temperature-dependent photoluminescence photoluminescence lifetime 

分 类 号：O471.1[理学—半导体物理]