Abstract
Spectroscopic and luminescent properties of the Pr-doped and Pr–Ag co-doped borate glasses with Li2B4O7 (Li2O–2B2O3) composition are studied and discussed. Experimental and theoretical oscillator strengths (fexp and ftheor), phenomenological parameters (Ω2, Ω4, Ω6), radiative properties (Arad, β, τrad), and quantum efficiencies (η) of the Pr3+ luminescence were calculated basing on the obtained experimental results and Judd–Ofelt theory. Most intense band of the Pr3+ luminescence is peaked at 601 nm (1D2 → 3H4 transition). Presence of the isolated Ag+ (4d10, 1S0) ions, small non-plasmonic Ag aggregates (Agmn+ nanoclusters), and plasmonic Ag metallic nanoparticles in the Li2B4O7:Pr,Ag glass was proposed basing on analysis of the photoluminescence and optical absorption spectra. Observed enhancement of luminescence intensity and increasing of stimulated emission cross-section and quantum efficiency of luminescence in the Li2B4O7:Pr,Ag glass is explained by energy transfer from Ag species to the Pr3+ ions as wells local-field effect induced by Ag nanoparticles.
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