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Journal of Spectroscopy
Volume 2013, Article ID 797232, 7 pages
Research Article

Study of Ultraviolet Emission Spectra in ZnO Thin Films

1Shenzhen Key Laboratory of Special Functional Materials, College of Materials Science and Engineering, Shenzhen University, Shenzhen 518060, China
2Institute of Optoelectronic Materials and Technology, South China Normal University, Guangzhou 510631, China

Received 7 June 2012; Accepted 21 August 2012

Academic Editor: Vincenza Crupi

Copyright © 2013 Y. M. Lu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Supplementary Material

The samples grown in different oxygen pressures show different luminescence properties. For all the samples, the PL spectra at different temperature indicate that the UV emission at room-temperature originate from the corporate contributions of the free exciton (FX) and free electrons-to-acceptor transitions (FA).

In lower oxygen pressure (0.2 Pa), FA emission dominate at room-temperature spectrum. With the increase of oxygen pressure, the intensity of FA emission is reduced gradually. In 3 Pa FX emission related to free exciton is main. The result indicate that the sample grown in lower oxygen pressure have a great deal the intrinsic defects due to deviations of the stoichiometric ratio.

  1. Supplementary Material