Effect of thermal treatment on spectroscopic properties of europium doped niobate phosphate glasses

Abstract

Glasses of the following composition 45Na2O•(55 - x)P2O5•xNb2O5 and 50Na2O•(50 - x)P2O5•xNb2O5 are studied. It is found that under the influence of γ-radiation the glass color changes. Optical absorption spectra, photoluminescence spectra, Rayleigh and Mandel'shtam - Brillouin scattering (RMBS) spectra are investigated in dependence of glass composition, europium concentration, thermal treatment duration and radiation dose. Effect of secondary thermal treatment is studied on the base of 45Na2O•25P2O5•30Nb2O5 doped with 1 mol.% Eu2O3. It is found that intensity of photoluminescence gives rise and decay time as well under thermal treatment at the temperature exceeding transition temperature by 50 degrees. RMBS spectra of glasses after thermal treatment demonstrate decrease of scattering intensity while Eu2O3 being doped. Effects obtained are accounted for europium ion local symmetry changes.