Luminescence spectroscopy of Ti ions in Li2O-CaF2-P2O5 glass ceramics

Li2O-CaF2-P2O5 glasses mixed with different concentrations of TiO2 (ranging from 0 to 0.8 mol%) were crystallized at 500 °C. The photo luminescence spectra of these samples excited with the wavelengths corresponding to their absorption edges have been recorded at room temperature. The spectra exhibited an emission band in the wavelength region 470-500 nm. The emission band is identified due to the charge transfer from O2− ion in to empty 3d orbital of octahedrally positioned Ti4+ ions. The analysis of the results further indicates the highest luminescence efficiency for the glass ceramic sample crystallized with 0.6 mol% of TiO2.