Preparation, Absorption Spectra, and Luminescence Properties of Er2O3- and Yb2O3-Doped Oxyfluoride Glasses in the SrF2–SiO2–B2O3–Bi2O3–ZnO–Y2O3 System

Oxyfluoride glasses in the SrF₂–SiO₂–B₂O₃–Bi₂O₃–ZnO–Y₂O₃ system have been designed and prepared at various ratios of batch components, and we have studied absorption spectra and luminescence properties of Er₂O₃- and Yb₂O₃-doped glasses. According to X-ray diffraction data, all of the glasses are X-ray amorphous. We have determined their glass transition temperature (t_g). Their local structure has been studied by IR spectroscopy and it has been shown that, independent of composition, the glasses contain complex polyborate anions formed by [BO₃] and [BO₄] groups. Bismuth is incorporated into the glass network to form Bi–O–Si bonds and network-formers in the form of [BiO₆] groups.