Luminescence and phonon side band analysis of Eu3+-doped lead fluorosilicate glasses

Lead fluorosilicate (SPbKNLFEu) glasses doped with different concentrations of Eu3+ ions have been prepared by the melt quenching technique. The structural and spectroscopic analysis have been carried out by Raman, absorption, excitation, emission, phonon side band (PSB) spectra and decay time measurements. The Judd-Ofelt theory has been used to predict the radiative properties for the emission levels of Eu3+ ions. Local structure around the Eu3+ ions and the phonon energy of SPbKNLFEu glasses have been confirmed on the basis of PSB associated with the F-7(0) -> D-5(2) transition. The decay curves of the D-5(0) and D-5(1) levels exhibit single exponential nature with a lifetime of 2240 mu s and 20 mu s, respectively. The multiphonon relaxation rates (W-mp) from the excited levels to the next lower level of Eu3+ ions have been calculated. The higher stimulated emission cross-section and the strong red emission at 613 nm corresponding to the D-5(0) -> F-7(2) transition suggests that the present lead fluorosilicate glasses could be useful for the optical display devices. (C) 2016 Elsevier B.V. All rights reserved.