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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.
In this paper, we study the spontaneous emission characteristics of quantum dots in a double-shell core-shell structure. The effective energy approximation theory is used to calculate the intrinsic energy and eigenfunctions of spherical and cylindrical PbSe / CdSe / ZnSe core- Spontaneous emission between Ec1 and Ev1. The effects of the CdSe shell thickness on the spontaneous emission spectra in the spherical PbSe / CdSe / ZnSe QDs and the relationship between the CdSe shell thickness and the PbSe / CdSe / ZnSe quantum dots The effect of the height of cylinder on the spontaneous emission spectrum is analyzed.The results show that the increase of the shell thickness of spherical quantum dots has no significant effect on the spontaneous emissivity between the conduction band and the lowest energy valence band The increase of shell thickness and height will lead to the blue shift of the spontaneous emissivity spectrum between the conduction band of the quantum dot system and the lowest energy band of the valence band.