Abstract
Lead tungsten tellurite (LTT) glasses doped with different Dy 3+ ion concentrations have been prepared and characterized through optical absorption, photoluminescence and decay measurements. The glassy nature of the LTT host has been confirmed through the XRD measurements. The three phenomelogical intensity parameters Ω λ ( λ = 2, 4, 6) have been determined from the absorption spectral intensities using the Judd–Ofelt (J–O) theory. The hypersensitivity of 6H 15/2 → 6F 11/2 transition based on the magnitude of Ω 2 parameter has also been discussed. By using the J–O intensity parameters several radiative properties such as spontaneous transition probabilities ( A R ), fluorescence branching ratios ( β R ) and radiative lifetimes ( τ R ) have been determined. The effect of Dy 3+ ion concentration on the emission intensities of 4F 9/2 → 6H J′ ( J′ = 15/2, 13/2, 11/2 and 9/2) transitions has also been reported.
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