Spectroscopic and laser properties of Sm3+ ions doped lithium fluoroborate glasses

The present work reports the effect of concentration on photoluminescence properties of Sm³⁺ ions doped lithium fluoroborate (LFB) glasses by using the absorption, emission and decay measurements. The Judd-Ofelt theory has been used to evaluate the three Judd-Ofelt intensity parameters and calculated oscillator strengths. LFBSm glasses exhibit intense reddish-orange emission when excited with 405 nm wavelength. Concentration quenching has been noticed beyond 1.0 mol% of Sm³⁺ ion concentration. The decay curves of ⁴G_5/2 level exhibited single exponential at lower concentrations and turn to non-exponential at higher concentrations. The evaluated radiative properties suggest that the ⁴G_5/2→⁶H_7/2 (602 nm) transition is responsible for reddish - orange luminescence which might be used in the development of visible lasers for photonic applications.