Eu 3+ and Gd 3+ spectroscopy in fluoroindate glasses

Abstract

Luminescence data for Eu 3+ and Gd 3+ in fluoroindate glasses are compared to those of a fluorozirconate glass. Emission is observed from Eu 3+ 5D J ( J=0, 1, 2 and 3) and Gd 3+ 6P 1 2 excited-state levels and the results put in evidence Eu-Eu and Gd-Eu energy transfer processes. Vibronic bands related to a 320 cm −1 vibrational mode could be observed for Eu 3+ luminescent transitions with Δ J=0,1 and 2 and also for the 6P 7 2 → 8S 7 2 transition of Gd 3+. Lanthanide ion site symmetry is closer to an inversion center in fluoroindate glasses than it is in fluorozirconate.