Abstract
Site selective luminescence spectra of Eu3+ in a lead germanate glass were measured at 150 K as a function of the excitation wavelength by using laser-induced fluorescence line narrowing (FLN) techniques. The energies of the Stark components of the 7F1 and 7F2 states were obtained by Gaussian fitting of the spectra. Assuming a C2v site symmetry, a crystal field (CF) analysis was carried out. The behaviour of the major CF ratios B44/B40 versus −B22/B20 seems to agree with the trend predicted by the model proposed by Brecher and Riseberg for the co-ordination of Eu3+ in oxide glasses. No effect due to the occurrence of an incipient amorphous phase separation is observed.
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