Spectroscopic properties of Sm3+ doped sodium-tellurite glasses: Judd-Ofelt analysis

Abstract Modifying the optical response of rare earth doped inorganic glasses for diverse optical applications is the current challenge in materials science and technology. We report the enhancement of the visible emissions of the Sm 3+ ions doped sodium-tellurite (TNS) glasses. The impacts of varying Sm 3+ ions concentration on the spectroscopic properties of such glass samples are evaluated. Synthesized glass samples are characterized via emission and absorption measurements. The UV–Vis–NIR absorption spectra revealed nine absorption peaks which are assigned to the transitions from the ground level ( 6 H 5/2 ) to 6 P 3/2 , 4 I 11/2 , 6 F 11/2 , 6 F 9/2 , 6 F 7/2 , 6 F 5/2 , 6 F 3/2 , 6 H 15/2 and 6 F 1/2 excited energy levels of Sm 3+ ions. Emission spectra of the prepared glass under 404 nm excitation wavelength consisted of four bands centered at 561 nm, 598 nm, 643 nm and 704 nm which are originated from 4 G 5/2 → 6 H J (J = 5/2, 7/2, 9/2 and 11/2) transitions. The experimental oscillator strengths, f exp are calculated from the area under absorption bands. Using Judd-Ofelt theory and fit process of least square, the phenomenological intensity parameters Ω λ ( λ  = 2, 4, 6) are obtained. In order to evaluate potential applications of Sm 3+ ions in telluride glasses, the spectroscopic parameters: radiative transition probability A R , branching ratio B R , radiative life time τ r and stimulated emission cross section σ λ for each band are calculated. These glass compositions could be a potential candidate for lasers.