Optical properties, concentration and thermal quenching of luminescence of Dy3+- doped La2O3-Na2O-ZnO-TeO2 glasses

•Tellurite glasses doped with Dy3+ were prepared by the melt quenching technique.•The Judd-Ofelt theory was applied to determine luminescence properties of Dy3+ ion.•The non-exponential decay curves have been analysed using Inokuti-Hirayama model.•The emission cross-sections of Dy3+ in the visible range are calculated.•Thermal quenching mechanism of 4F9/2 level of Dy3+ has been proposed.