Absorption and emission spectral studies of Sm3+-doped lead tungstate tellurite glasses

Graphical abstract: Display Omitted Research highlights: → LTTSm glasses exhibits intense reddish-orange emission under 477 nm excitation. → Concentration quenching is observed beyond 1.0 mol% of Sm3+ ion concentration. → Decay curves of 4G5/2 state exhibits single exponential nature in all the glasses. - Abstract: The present work reports the effect of concentration on photoluminescence properties of Sm3+ ions doped lead tungstate tellurite (LTTSm) glasses by using the absorption, emission and decay measurements. The Judd-Ofelt theory has been used to evaluate the three Judd-Ofelt intensity parameters (Ω2,4,6) and calculated oscillator strengths (fc). LTTSm glasses exhibited intense reddish-orange emission when excited with 477 nm wavelength. Concentration quenching has been noticed beyond 1.0 mol% of Sm3+ ion concentration. The decay curves of 4G5/2 level exhibited single exponential behavior for all the concentrations and the measured lifetimes are found to depend strongly on Sm3+ concentration. From the emission characteristic parameters of 4G5/2 level, it is concluded that the LTTSm glasses could be useful for photonic devices like visible lasers, fluorescent display devices and optical amplifiers.