Journal
JOURNAL OF LUMINESCENCE
Volume 129, Issue 2, Pages 101-104Publisher
ELSEVIER
DOI: 10.1016/j.jlumin.2008.09.007
Keywords
CaMoO4 crystal; Electronic structure; Optical properties; Oxygen vacancy
Categories
Funding
- Doctor Foundation of USST [X696]
- Scientific Development Foundation of Shanghai Municipal Education Committee, China [06E2032]
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The electronic structures, dielectric functions and absorption spectra for the CaMoO4 (CMO) crystal with and without oxygen vacancy V-O(2+) have been calculated using the CASTEP code with the lattice structure optimized. The calculated results indicate that the optical properties of the CMO crystal show anisotropy and its optical symmetry coincides with the lattice structure geometry of the CMO crystal. The calculated absorption spectra indicate that the perfect CMO crystal does not display absorption band in the visible and near-ultraviolet range. However, in this range, the absorption spectra of the CMO crystal containing V-O(2+) exhibit one peak at about 1.84 eV (673 nm). It predicates that the 680 nm absorption band is related to the existence of V-O(2+) in the CMO crystal. (C) 2008 Elsevier B.V. All rights reserved.
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