Abstract
Sm 3+-doped lead phosphate-based glasses modified with niobium have been prepared and characterized by optical absorption, emission spectra and decay curve analysis. The peak positions and intensities of the absorption spectrum of 1.0 mol% Sm 2O 3-doped glass have been analysed by the free-ion Hamiltonian model and Judd–Ofelt analysis, respectively. The predicted radiative properties are comparable with the experimental values. The emission properties and lifetimes of the 4G 5/2 level for different Sm 3+ ion concentrations have been determined. Lifetime of the 4G 5/2 level decreases, with increase of Sm 3+ ions concentration, from 2.52 (0.1 mol%) to 0.57 ms (4.0 mol%) due to cross-relaxation energy transfer (ET) between Sm 3+ ions. The decay curve for the 4G 5/2 level is single exponential for 0.1 mol% Sm 2O 3 ions concentration and become non-exponential from 0.5 mol%. The non-exponential decay curves are well fitted to the Yokoto–Tanimoto model. From decay curve analyses, ET, donor to acceptor interaction and diffusion parameters have been obtained and their relative variation with concentration of Sm 3+ ions has been discussed. The calculated relative donor quantum yield also supports ET between Sm 3+ ions.
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