Abstract
Abstract This article presents the optical absorption and emission properties of Dy3+ in mixed alkali borate glasses of the type 67.5B2O3 · xLi2O · (32 − x)Na2O, 67.5B2O3 · xLi2O · (32 − x)K2O and 67.5B2O3 · xNa2O · (32 − x)K2O (where x = 8, 12, 16, 20 and 24). The variation of the Judd–Ofelt intensity parameters (Ω2, Ω4, Ω6), hypersensitive band positions, radiative transition probabilities (Arad), branching ratios (β) and emission cross-sections (σp) with x has been discussed in detail. The changes in position of hypersensitive transition and intensity parameters in the optical absorption spectra are correlated to the structural changes in the host glass matrix. The variation of Ω2 with x has been attributed to changes in the asymmetry of the ligand field at the rare earth ion site and to the changes in their rare earth-oxygen covalency. The estimated radiative lifetimes for the excited states 4I15/2, 4F9/2, 6F3/2, 6F5/2 and 6F11/2(6H9/2) of Dy3+ ion are presented. Branching ratios (β) and integrated absorption cross-sections (Σ) are reported for certain important transitions. From the luminescence spectra, emission cross-sections (σp) are reported for the transitions 4F9/2 → 6H11/2, 4F9/2 → 6H13/2 and 4F9/2 → 6H15/2. The variation of all these parameters with x has been studied in the above three-mixed alkali borate glasses.
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