CdSe/ZnSe超薄层中两类量子岛（点）之间的激子转移和它们的光学性质研究

在变温条件下，对CdSe/ZnSe超薄层中的两类量子岛（点）进行了荧光光谱研究.在低温时，这两类岛之间的激子转移主要是通过隧穿过程，而随着温度的升高，局域激子的热跳跃逐渐取代隧穿过程成为激子转移的主导机理.研究还发现，小岛是具有准零维光学性质且不同于大岛的纳米团簇，它们激子的光学特性之间存在一定的差异，但实验表明两类量子岛之间又有很大的光学关联.关键词：量子点激子CdSe

Exciton transfer and the optical properties of two types of quantum islands (dots) in ultrathin CdSe/ZnSe layers

We have investigated the temperature_dependent photoluminescence of two types of quantum islands in ultrathin CdSe/ZnSe layers. At low temperatures, excitons in these two types of quantum islands can transfer by tunneling. The hopping process of the localized excitons gradually becomes the dominant mechanism with increasing temperature. We found that the small islands are nano_scale clusters with quasi_zero_dimensional properties, which are different from those of the large islands. Experiments indicated that these two types of islands are optically correlated although their excitonic properties are different.