Violet photoluminescence from shell layer of Zn/ZnO core-shell nanoparticles induced by laser ablation

被引：225
|
作者：
Zeng, HB [1 ]
Cai, WP [1 ]
Hu, JL [1 ]
Duan, GT [1 ]
Liu, PS [1 ]
Li, Y [1 ]
机构：
[1] Chinese Acad Sci, Inst Solid State Phys, Key Lab Mat Phys, Anhui Key Lab Nanomat & Nanotechnol, Hefei 230031, Peoples R China
来源：
APPLIED PHYSICS LETTERS | 2006年 / 88卷 / 17期
基金：
中国国家自然科学基金;
关键词：
D O I：
10.1063/1.2196051
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
A strong violet photoluminescence (PL) band at 425 nm (2.92 eV) was observed from the ZnO shell layer of the Zn/ZnO core-shell nanoparticles prepared by laser ablation in liquid media. Such violet PL decreases with increase of the shell thickness or annealing temperature, showing good controllability. Based on the electron paramagnetic resonance measurements, the violet emission is attributed to the electronic transition from the defect level, corresponding to high-concentration zinc interstitials, to the valence band. This study is in favor to clarify the defect-related emissions and to extend the optical and electronic applications of nanostructured ZnO. (c) 2006 American Institute of Physics.
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页数：3
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