Abstract
Sodium germanate glasses of compositions (x − 0.5)Na 2O–(100 − x)GeO 2–0.5Eu 2O 3 with x = 10, 16, and 22 were studied using laser-induced fluorescence line narrowing (FLN) techniques. From the site selective luminescence spectra of Eu 3+ at 20 K, the energies of the Stark components of the 7F 1 and 7F 2 states were obtained, and a crystal field (CF) analysis was carried out assuming a C 2v site symmetry. The dependence of the CF parameters B kq on the excitation wavenumber was similar to that observed in other oxide glasses. The behavior of the CF ratios B 22/B 20 and B 44/B 40 appears to be consistent with that calculated using the geometric model proposed by Brecher and Riseberg. The behavior of the CF strength parameter S suggests that the amount of network modifier in the glass host does not influence the CF at the Eu 3+ sites. No evidence was found in the FLN spectra of the influence of 6-coordinated germanium.
Published Version
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