Surface effects on photoluminescence of single ZnO nanowires

The influence of surface effects on the temperature dependent photoluminescence (PL) spectra from individual ZnO nanowires has been studied. It is found that the surface effects of the nanowire are very important in both ultraviolet (UV) and visible emission. We propose a new luminescence mechanism...

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Bibliographic Details
Published in:Physics letters. A 2008-06, Vol.372 (24), p.4505-4509
Main Authors: Liao, Zhi-Min, Zhang, Hong-Zhou, Zhou, Yang-Bo, Xu, Jun, Zhang, Jing-Min, Yu, Da-Peng
Format: Article
Language:English
Subjects:
Blue luminescence
Exciton emissions
Oxygen vacancies
Photoluminescence
Surface effects
ZnO nanowires
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Summary:The influence of surface effects on the temperature dependent photoluminescence (PL) spectra from individual ZnO nanowires has been studied. It is found that the surface effects of the nanowire are very important in both ultraviolet (UV) and visible emission. We propose a new luminescence mechanism based on the recombination related to oxygen vacancies to explain the temperature dependent visible emission, which is significantly influenced by the carrier depletion and band bending caused by surface effects. In addition, the observed attenuation of UV emission with increasing temperature is ascribed to the decreasing depletion region and the increasing surface states related nonradiative recombination.
ISSN:0375-9601
1873-2429
DOI:10.1016/j.physleta.2008.04.013