Energy harvesting and conversion mechanisms for intrinsic upconverted mechano-persistent luminescence in CaZnOS
Energy harvesting and conversion mechanisms for intrinsic upconverted mechano-persistent luminescence in CaZnOS
复制标题
CaZnOS 中内在上转换机械持久发光的能量收集和转换机制。
DOI：
10.1039/c6cp04706h
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发表时间：
2016-10-07
影响因子：
3.3
通讯作者：
Huang, Bolong
中科院分区：
文献类型：
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作者：
Huang, Bolong
通过对本征点缺陷的研究，解释了CaZnOS中本征上转换机械持久发光的能量捕获和转换机制。我们发现，空位缺陷，如锌空位和氧空位，以及肖特基对缺陷，都是能量收集中心，它们非常容易形成，非常活跃。发现它们分别位于价带或导带边缘附近的超深电子或空穴陷阱能级。这导致耦合和交换效应，以沿着路径通过局域态连续收集和传输宿主电荷到深度复合能级。起爆能垒很小，可以通过环境热刺激或量子隧道来克服。天然激活剂如V-O(2+)、V-ZnO(2+)和V-CaZnOS(2+)作为能量转换中心，将能量转移到光子发射中。这为发展上转换机械持久发光提供了坚实的理论参考。
We interpreted the mechanisms of energy harvesting and conversion for intrinsic upconverted mechano-persistent luminescence in CaZnOS through a native point defects study. We found that vacancy defects such as Zn and O vacancies, as well as Schottky pair defects, act as energy harvesting centers; they are very readily formed and very active. They are found to be extra deep electron or hole trap levels near the valence or conduction band edges, respectively. This leads to a coupling and exchange effect to continuously collect and transport host charges along a path via localized states to deep recombination levels. The initiating energy barrier is small and can be overcome by ambient thermal stimulation or quantum tunneling. Native activators such as V-O(2+), V-ZnO(2+), and V-CaZnOS(2+) function as energy conversion centers to transfer energy into photon emissions. This gives a solid theoretical reference for developing upconverted mechano-persistent luminescence.