Correlation between the characteristic green emissions and specific defects of ZnO
Tay, Yee Yan
Tan, T. T.
Boey, Freddy Yin Chiang
Liang, Meng Heng
Date of Issue2010
School of Materials Science and Engineering
In this work, the correlation between the characteristic green emissions and specific defects of ZnO was investigated through a series of experiments that were designed to separate the subtle interplays among the various types of specific defects. With physical analysis and multimode Brownian oscillator modeling, the underlying mechanisms of the variant effects on green emission were revealed. The results demonstrate that the observed green emissions can be identified as two types of individual emissions, namely high energy and low energy, that are associated with specific defects and their locations. The surface modification that leads to downwards band bending was found to be responsible for the high-energy green emission. The relationship between the intensity of the low- energy green emission and the crystallographic lattice contraction indicates that oxygen vacancy is the dominant cause of such an emission that resides within the bulk of ZnO.
DRNTU::Engineering::Materials::Photonics and optoelectronics materials
Physical chemistry chemical physics
© 2010 Royal Society of Chemistry. This paper was published in Physical Chemistry Chemical Physics and is made available as an electronic reprint (preprint) with permission of Royal Society of Chemistry. The paper can be found at: [Doi: http://dx.doi.org/10.1039/b922372j]. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.