Effect of Modifiers on Optical and Structural Properties of Barium Gallo-Germanate Glasses Doped with RE Ions

In this paper structural and luminescence properties of modified barium-gallo-germanate glasses doped with Dy<sup>3+</sup> and Eu<sup>3+</sup> ions are investigated. Barium ions in the glass structure were gradually replaced with antimony ions. Luminescence properties were determined on the basis of emission spectra of Eu<sup>3+</sup> and Dy<sup>3+</sup> ions which were used as a dopant in prepared glass series. MIR spectra of studied glass series present the glass structure tendency to polymerization through the observed shift of the main band assigned to Ge-O-Ge and Ge-O<sup>−</sup> (NBO – non-bridging oxygen) bonds vibrations. Moreover, emission spectra of Eu<sup>3+</sup> and Dy<sup>3+</sup> ions present the increasing tendency to the ordering of Eu<sup>3+</sup> and Dy<sup>3+</sup> local environment through the analysis of changes of ED/MD (electric dipole to magnetic dipole transitions) and Y/B (yellow to blue) ratio.

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