Abstract
We present the structural, vibrational and luminescence properties of Na- and Li- stabilized gallium-titanium oxides studied by optical spectroscopy techniques. The microstructure and characteristic vibrational modes of this homologous series, which are not well known, have been determined with the aid of Raman spectroscopy and compared to density functional theory (DFT) calculations. On the other hand, intense cathodoluminescence bands in the visible and in the near-infrared are observed depending on the term of the series and related to native defects. Besides, the study of the temperature evolution of the photoluminescence and photoluminescence excitation spectra has allowed us to determine both the band gap energy temperature dependence as well as to get some insight into the luminescence mechanisms of the defect-related emissions in these compounds. The results pave the way to exploit the physical properties of these Na- and Li- gallium titanate series in functional optoelectronic devices to operate from the ultraviolet to the infrared range.
Published Version
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