Absorption and emission properties of Eu3+ ions in Sodium fluoroborate glasses

This article presents the optical absorption and emission properties of Eu3+ in sodium fluoroborate glasses of the type XNaF·(89–X)B2O3·10Al2O3·1Eu2O3 (where X=8, 12, 16, 20, and 24). Judd–Ofelt (JO) intensity parameters (Ω2, Ω4, Ω6) are derived from the absorption spectra. These parameters have been used to calculate radiative transition probabilities (Arad), lifetimes (τR) and branching ratios (βR) for the excited level 5D0. The predicted values of τR are compared with the measured values for 5D0 level for five glass compositions (Glass (A–E)). The stimulated emission cross section σ(λP) are also evaluated for the 5D0→7FJ (J=0,1,2,3,4) transitions.