Dependence of the stimulated luminescence threshold in ZnO nanocrystals on their geometric shape

被引：4
|
作者：
Gruzintsev, A. N. [1 ]
Redkin, A. N. [1 ]
Barthou, C. [2 ]
机构：
[1] Russian Acad Sci, Inst Microelect Technol & Ultrahigh Pur Mat, Chernogolovka 142432, Moscow Oblast, Russia
[2] Univ Paris 06, F-75252 Paris 05, France
来源：
SEMICONDUCTORS | 2010年 / 44卷 / 05期
基金：
俄罗斯基础研究基金会;
关键词：
PHOTOLUMINESCENCE; EXCITONS;
D O I：
10.1134/S1063782610050143
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
The effect of the shape and dimensions of zinc oxide nanocrystals on the spontaneous luminescence decay times and the thresholds of stimulated luminescence in the ultraviolet spectral region is studied. It is shown that the columnar nanocrystals with hexagonal faceting exhibit the lowest threshold power of optical excitation for the diameters of the nanocavities are 100-200 nm, comparable to the absorption length for the excitation light. Different mechanisms of lasing are established for nanocrystals shaped as prisms and pyramids with a hexagonal base. Variations in the decay times and lasing thresholds can be attributed to different local densities of photon states in regularly shaped nanocrystals.
引用
收藏
页码：628 / 633
页数：6
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