The visible luminescence of silicate glass (SiO2 (> 70%)-R2O3[B2O3, Al2O3]-RO[ZnO, MgO, CaO, BaO]-R2O[Na2O, K2O]) doped with various concentrations of dysprosium was investigated. The emission, excitation and absorption spectra, as well as kinetic parameters, were measured over a temperature range from 20 to 300 K. The Judd-Ofelt analysis was applied to the data, in order to calculate transition rates and branching ratios for all observed emission bands. Concentration quenching was experimentally observed at a Dy ion concentration higher than 8 x 10(19) cm(-3) and explained by an analytical model based on the Inokuti-Hirayama theory. The quantum efficiency of visible luminescence and the stimulated emission cross-section at 570 nm were (85 +/- 50% and (3.4 +/- 0.4) x 10(-21) cm(2), respectively. (C) 1997 Elsevier Science B.V.
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