Abstract
Li 2O–MO (Nb 2O 5, MoO 3 and WO 3)–B 2O 3 glasses doped with four rare earth ions, viz., Pr 3+, Nd 3+, Sm 3+ and Er 3+ (of 1.0 mol% each) were prepared. The glasses were characterized by X-ray diffraction, differential scanning calorimetry, ESR, optical absorption and photoluminescence spectra. From the measured intensities of various absorption bands of these glasses, the Judd–Ofelt parameters Ω 2, Ω 4 and Ω 6 have been evaluated. The Judd–Ofelt theory could successfully be applied to characterize the absorption and luminescence spectra of these glasses. From this theory, various radiative properties like transition probability A, branching ratio β r, the radiative life time τ r and the emission cross-section σ E for various emission levels of these glasses have been determined and reported. An attempt has also been made to throw some light on the relationship between the structural modifications and luminescence efficiencies of all the three glasses. The analysis of the data indicated high non-radiative losses in Nb 2O 5 mixed glasses.
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