Abstract
Optical absorption and emission spectra of Eu +3 in germanate glass, as well as the fluorescence decay time of D 0 5 → ∑ 0 6 F i 7 were measured. Oscillator strengths up to 360 nm were calculated and compared with those of Eu +3 in various glasses. It was found that the hypersensitive transitions 7 F 0→ 5 D 2 and 5 D 0→ 7 F 2 were stronger in germanate than in silicate or phosphate glasses, owing to covalency effects. Transition rates and efficiencies from 5 D 0 to the ground levels and 5 D 1→ 5 D 0 were calculated. Fluorescence was observed from the 5 D 2, 5 D 3, 5 L 6 levels in addition to that from 5 D 0 and 5 D 1 observed in phosphate and silicate glasses. The appearence of fluorescence from the higher levels is attributed to the influence of the lower phonon energy of germanate glasses.
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