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Applied Physics Letters / Volume 96 / Issue 22 / NANOSCALE SCIENCE AND DESIGN

Appl. Phys. Lett. 96, 223105 (2010); http://dx.doi.org/10.1063/1.3443636 (3 pages)

Tailoring the luminescence emission of ZnO nanostructures by hydrothermal post-treatment in water

Baodian Yao, Lin Feng, Chun Cheng, Michael M. T. Loy, and Ning Wang

Department of Physics and William Mong Institute of Nano Science and Technology, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong

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(Received 10 February 2010; accepted 8 May 2010; published online 2 June 2010)

ZnO nanorods and nanowires fabricated from solution methods exhibit poor optical properties. Using hydrothermal post-treatment in pure water, the green emission can be significantly suppressed at 250 °C and completely eliminated at 350 °C. Meanwhile, the near-band-edge UV radiative recombination efficiency is greatly improved and the UV emission intensity is increased up to 50 times. The morphology and structure of the ZnO nanostructures remain intact after the treatment. As evidenced by the electron paramagnetic resonance investigation, this simple treatment can completely remove or passivate the point defects responsible for the green emission of as-grown ZnO.

© 2010 American Institute of Physics

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KEYWORDS and PACS

Keywords

II-VI semiconductors, nanorods, nanowires, paramagnetic resonance, photoluminescence, point defects, semiconductor quantum wires, wide band gap semiconductors, zinc compounds

PACS

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3443636

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

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$abstract.society.value is a Member of CrossRef American Institute of Physics

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