Exciton Localization and Optical Properties Improvement in Nanocrystal-Embedded ZnO Core鈥揝hell Nanowires
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- 作者：Rui Chen ; Quan-Lin Ye ; Tingchao He ; Van Duong Ta ; Yongjun Ying ; Yee Yan Tay ; Tom Wu ; Handong Sun
- 刊名：Nano Letters
- 出版年：2013
- 出版时间：February 13, 2013
- 年：2013
- 卷：13
- 期：2
- 页码：734-739
- 全文大小：433K
- 年卷期：v.13,no.2(February 13, 2013)
- ISSN：1530-6992
文摘
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鈥搒hell 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鈥搒hell nanostructures shed light on developing stable and high-efficiency excitonic optoelectronic devices such as light-emitting diodes and lasers.