Blue luminescence in the WO3P2O5ZnO glass system

Abstract Luminescence in WO 3 P 2 O 5 ZnO glasses was measured and its origin was investigated. With XRD measurements, the amorphous phase of the glasses was determined to exclude a crystalline-phase region as the source of luminescence. A blue emission by 320 nm excitation was observed, similar to that in ZnWO 4 crystals. The decomposition of the emission spectra into three bands and the Stokes shift were close to the results for ZnWO 4 crystals. The laser spectroscopy revealed decay behavior similar to that for ZnWO 4 crystals. Raman spectroscopy on the glasses showed the presence of WO 6 groups in the glass. We conclude that the origin of the luminescence of the glasses is the same as that of ZnWO 4 . The luminescence in the glass is an intrinsic feature of the WO 6 group. It results from the electronic excitation of O(2p) to W(5d) energy levels and the following decay in the WO 6 groups of the glass.