Radiative recombination in photoexcited quantum dots up to room temperature: The role of fine-structure effects
Radiative recombination in photoexcited quantum dots up to room temperature: The role of fine-structure effects
复制标题
室温下光激发量子点的辐射复合：精细结构效应的作用
DOI：
10.1103/physrevb.81.241306
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发表时间：
2010
影响因子：
3.7
通讯作者：
G. Bacher
中科院分区：
文献类型：
--
作者：
T. Kümmell;S. Zaitsev;A. Gust;C. Kruse;D. Hommel;G. Bacher
我们证明了主导的辐射复合在高品质的自组装量子点的所有方式，直到室温。这允许一个证明的理论预测的特征加倍的辐射复合时间随温度的升高，完全由精细结构效应引起的。在整个温度范围内，光致发光的瞬态衰减可以描述由温度无关的辐射衰减率的暗和亮激子，分别考虑到热激活的暗和亮状态和暗激子积累之间的相互作用。
We demonstrate dominant radiative recombination in high-quality self-assembled quantum dots all the way up to room temperature. This allows a proof of the theoretically predicted characteristic doubling of the radiative recombination time with increasing temperature, entirely caused by fine-structure effects. Over the whole temperature range, the transient decay of the photoluminescence can be described by temperature-independent radiative decay rates of dark and bright excitons, respectively, taking into account a thermally activated interplay between dark and bright states and dark-exciton accumulation.