Site selective study of Eu3+-doped transparent oxyfluoride glass ceramics

Abstract

Optical properties of ${\mathrm{Eu}}^{\text{3+}}$ ions in oxyfluoride glasses and glass ceramics doped with two different concentrations, 0.1 and 1 mol %, have been analyzed and compared with previous results for higher concentrated samples, 2.5 mol %. The ${\mathrm{Eu}}^{\text{3+}}$ ions in the 0.1 mol % doped glass ceramics are diluted into like crystalline environments with higher symmetry and lower coupled phonon energy than in the precursor glasses; meanwhile in the 1 mol % doped glass ceramics the presence of ${\mathrm{EuF}}_3$ clusters has been observed in addition to diluted ions. Fluorescence line narrowing measurements indicate the presence of two main fluoride site distributions for the diluted ${\mathrm{Eu}}^{\text{3+}}$ ions in both glass ceramics.