Abstract
In this study, role of three modifier oxides (viz., MgO, CaO and SrO) on red luminescence efficiency of Eu3+ ions in Sb2O3‒Li2O glass system was investigated. The absorption spectra of these glasses exhibited the bands due to 7F0→ 5D4,3,2,1,0,5G4,2,5L6 and 7F0, 1→7F6 transitions in the visible and NIR regions, respectively. Emission spectra recorded at λexc=394 nm exhibited the bands due to 5D0→7FJ (J = 0 to 4) transitions. Out of these, the band due to5D0→7F2 (red emission ) was found to be more intense. J-O parameters, Ω2 and Ω4 were evaluated using integral R/O ratio of emission spectra. Radiative parameters viz., AR, βR and σEP for Eu3+ions were calculated using J-O parameters, These parameters were observed to be the maximal for SrO mixed glasses. Variations of local symmetry and covalency in the vicinity of Eu3+ ions were found to be responsible for such larger values of these parameters and for intense red emission for SrO mixed glasses.
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