Temperature dependence of the interband transition in a V2O5 film

The temperature dependence of the interband transition in an alpha-V2O5 film was investigated using absorption and photoluminescence spectral measurements at a temperature range of 10-300 K. Transmission measurements in the experimental temperature range indicate that the alpha-V2O5 film has two distinct interband transitions, implying indirect and direct transitions. This result was confirmed by spectroscopic ellipsometry. The blue shift of both the transitions in the alpha-V2O5 film with decreasing temperature was explained by a reduction in the lattice-dilatation effect and the electron-phonon interaction. The PL measurements in the experimental temperature range showed that the emission near 530 nm is due to the indirect transition in the alpha-V2O5 film. (C) 2013 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License.