Temperature dependence of photoluminescence properties of water-soluble ZnSe quantum dots
Temperature dependence of photoluminescence properties of water-soluble ZnSe quantum dots
复制标题
水溶性ZnSe量子点光致发光特性的温度依赖性
DOI：
10.1088/1742-6596/1220/1/012024
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Kim DaeGwi
中科院分区：
文献类型：
--
作者：
Lee Yong-Shin;Taniguchi Taichi;Kim DaeGwi
研究了水热法制备的ZnSe量子点的光学性质。的光致发光（PL）的衰减曲线变得更慢，随着温度的增加，高达160 K，相反的一个普通的行为，由于热淬火。PL-衰减曲线的温度依赖性解释由一个基态和两个激发态的低躺束缚激子和高躺暗激子状态组成的三态模型。通过对量子点的温度依赖性的分析表明，暗激子态对ZnSe量子点的PL衰减过程有贡献。
We have investigated the optical properties of ZnSe quantum dots (QDs) prepared by a hydrothermal method. The photoluminescence (PL)-decay profiles become slower with an increase in temperature up to 160 K, contrary to an ordinary behaviour due to thermal quenching. The temperature dependence of the PL-decay profile is explained by a three-state model consisting of a ground state and two excited states of the lower-lying bound-exciton and higher-lying dark-exciton states. The analysis of the temperature dependence of the decay time indicates that the dark-exciton state contributes to the PL-decay process in the ZnSe QDs.