期刊
NANO LETTERS
卷 13, 期 2, 页码 734-739出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl304433m
关键词
ZnO; photoluminescence; exciton; localization; random lasing
类别
资金
- Singapore Ministry of Education through the Academic Research Fund (Tier 1) [RG63/10]
- Singapore National Research Foundation through the Competitive Research Programme (CRP) [NRF-CRP5-2009-04, NRF-CRP6-2010-02]
We present a comparative investigation of the morphological, structural, and optical properties of vertically aligned ZnO nanowires (NWs) before and after high energy argon ion (Ar+) milling. It is found that the outer regions of the as-grown sample change from crystalline to amorphous, and ZnO core-shell NWs with ZnO nanocrystals embedded are formed after Ar+ milling. Optical properties of the ZnO NWs have been investigated systematically through power and temperature dependent photoluminescence measurements, and the phenomenon of exciton localization as well as the relevant favorable photoluminescence characteristics is elucidated. Interestingly, under high density optical pumping at room temperature, coherent random lasing action is observed, which is ascribed to exciton localization and strong scattering. Our results on the unique optical properties of localized exciton in ZnO core-shell nanostructures shed light on developing stable and high-efficiency excitonic optoelectronic devices such as light-emitting diodes and lasers.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据