与量子尺寸和几何相关的PbSe/CdSe/ZnSe量子点量子阱的自发辐射

与量子尺寸和几何相关的PbSe/CdSe/ZnSe量子点量子阱的自发辐射 Quantum Size-and Geometry-Dependent Spontaneous Emission in PbSe/CdSe/ZnSe Quantum-Dot Quantum-Well 郭晓珍 GUO Xiaozhen1 1 first-author 熊贵光 XIONG Guiguang1 1 2 武汉大学物理科学与技术学院 武汉大学物理科学与技术学院 Shool of Physics and Technology,Wuhan University Shool of Physics and Technology,Wuhan University 声光材料与器件教育部重点实验室 声光材料与器件教育部重点实验室 Key Laboratory of Acoustic and Photonics Material and Devices,Ministry of Education,Wuhan University Key Laboratory of Acoustic and Photonics Material and Devices,Ministry of Education,Wuhan University 本文研究了双壳层核壳结构量子点带间自发辐射特性,采用有效质量近似理论计算了球形和圆柱形PbSe/CdSe/ZnSe核壳结构量子点的本征能量和本征波函数以及系统能级Ec1和Ev1之间的自发辐射.进一步讨论了球形PbSe/CdSe/ZnSe量子点中,CdSe壳层厚度对自发辐射谱的影响以及柱形PbSe/CdSe/ZnSe量子点中,CdSe壳层厚度和圆柱体的高度变化对自发辐射谱的影响.分析结果表明,球形量子点的壳层厚度增加对导带和价带最低能级间的自发辐射率没有太大的影响.而圆柱形量子点的壳层厚度和高度的增加都会导致量子点系统导带和价带最低能级间的自发辐射率谱的蓝移. This paper is about the spontaneous emission of quantum dot with double shell structure. The eigenenergies and eigenfunctions of Pbse/CdSe/ZnSe spherical and cylindrical quantum dot quantum wells （QDQW） with core/shell/shell structure have been calculated under the effective-mass approximation. The spontaneous emissions induced by the transition between the energy levels Ec1 and Ev1 of Pbse/CdSe/ZnSe QDQW have been calculated numerically. In particular,the influence of the CdSe shell thicknesses variation on the spontaneous transition has been studied in the spherical and cylindrical quantum dot quantum well （QDQW）. In addition,the influence of the cylindrical quantum dot’s height on the spontaneous transition has been also studied. It has been shown from the calculation results that the effect of the variation of the CdSe shell thickness in the cylindrical QDQW is bigger than that in the spherical QDQW. And the increasing height in the cylindrical QDQW makes the spontaneous emission spectra have a blue-shift. 量子点量子阱 有效质量近似 量子尺寸效应 自发辐射率 quantum-dot quantum-well effective-mass approximation quantum size effect spontaneous emission rate 10.14188/j.1671-8836.2010.04.015 O471.1 国家自然科学基金资助项目（10704052） 2010-04-01 2021-04-01 4 56