Investigation of photoluminescence in undoped and Ag-doped ZnO flowerlike nanocrystals

被引：73
作者：
Jin, Yunxia [1 ]
Cui, Qiliang [1 ]
Wang, Kai [1 ]
Hao, Jian [1 ]
Wang, Qiushi [1 ]
Zhang, Jian [1 ]
机构：
[1] Jilin Univ, State Key Lab Superhard Mat, Changchun 130012, Peoples R China
来源：
JOURNAL OF APPLIED PHYSICS | 2011年 / 109卷 / 05期
基金：
美国国家科学基金会;
关键词：
OPTICAL-PROPERTIES;
D O I：
10.1063/1.3549826
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Flower-shaped undoped and Ag-doped ZnO nanocrystals have been synthesized by a hydrothermal method. The nanocrystals have been investigated by x-ray powder diffraction and all the particles are found to show the wurtzite structure. Scanning electron microscopy and high resolution transmission electron microscopy reveal the flower-shaped structures of the samples consist of many pricklelike nanopetals. The x-ray photoelectron spectroscopy results provide evidence that Ag ions are mainly in the monovalent state and incorporated into the ZnO lattice at Zn2+ sites. It was found from the UV-visible spectra that the bandgap of ZnO decreases due to Ag doping. Excellent enhancement of luminescence properties in the green band is observed in Ag-doped ZnO nanocrystals. The origin of this enhancement was discussed. It was demonstrated that oxygen vacancies and a spin-split impurity band are the key factors for deep level emissions. We believe that the present approach is a very simple but effective one for synthesis of novel ZnO complex micro/nanostructures, and these flowerlike Ag-doped ZnO nanocrystals may have good prospects in scientific and industrial applications. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3549826]
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页数：5
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