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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Role of Core-Shell Interfaces on Exciton Recombination in CdSe-Cd_xZn_(1-x)S Quantum Dots
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Role of Core-Shell Interfaces on Exciton Recombination in CdSe-Cd_xZn_(1-x)S Quantum Dots

机译:CdSe-Cd_xZn_(1-x)S量子点中核壳界面在激子复合中的作用

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摘要

The shell thickness and composition of CdSe-Cd_xZn_(1-x)S core—shell quantum dots (QDs) are defining parameters for the efficiency of such materials as light emitters. In this work we present a detailed study into the optical absorption and fluorescence properties of CdSe—CdS, CdSe—Cd_(0.5)Zn_(0.5)S, and CdSe—ZnS QDs as a function of shell thickness. Moreover, the single-exciton recombination dynamics of these systems are analyzed by means of a time-correlated single-photon counting technique and directly related to the specific core—shell interfaces of the various QDs studied using a phenomenological kinetic model. The findings from this model highlight the strong role of the core—shell interface on both steady state photoluminescence and exciton recombination dynamics in these systems.
机译:CdSe-Cd_xZn_(1-x)S核的壳厚度和壳-壳量子点(QDs)是确定这类材料(如发光体)效率的参数。在这项工作中,我们对CdSe-CdS,CdSe-Cd_(0.5)Zn_(0.5)S和CdSe-ZnS QDs的光吸收和荧光性质作为壳厚度的函数进行了详细研究。而且,通过时间相关的单光子计数技术分析了这些系统的单激子复合动力学,并与使用现象动力学模型研究的各种量子点的特定核-壳界面直接相关。该模型的发现凸显了核-壳界面在这些系统中的稳态光致发光和激子复合动力学中的强大作用。

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