Site selective spectroscopy of Eu3+ in heavy-metal oxide glasses

In this work, we report time-resolved line-narrowed fluorescence spectra of the 5D0 → 7F0−6 transitions of Eu3+-doped 40Bi2O3–40PbO–10Ga2O3–10GeO2 and 60GeO2–25PbO–15Nb2O5 glasses obtained at 10 K by using different resonant excitation wavelengths along the 7F0 → 5D0 transition. The wavelength dependence of the 7F1 splitting in both glasses suggests the existence of a broad distribution of Eu3+ centres possessing a variety of local field environments. The influence of the local coordination ions on the optical properties of Eu3+ has been studied by analysing the dependence of the crystal field (CF) parameters on the excitation energy along the 7F0 → 5D0 transition.