STRUCTURE FEATURES OF THE SODIUM-GERMANATE GLASSES DOPED WITH YTTERBIUM ERBIUM RETRIEVED FROM RAMAN SPECTROSCOPY

Subject of Research.The paper deals with study of Raman spectra and luminescence spectra in the visible region of the sodium-germanate glass: 49 GeO₂ – 13 Na₂O – 27 Yb₂O₃ – 11 La₂O₃ - 0,25 Er₂O₃  and presents research results. In addition, this glass is doped with 5 mol% of the following components MgO, BaO, Al₂O₃, PbO, Nb₂O₅, TiO₂, SiO₂, P₂O₅ in order to study the effect of these additives on the structure of the glassy matrix and the anti-Stokes luminescence spectra of erbium ions. Method. Raman scatteringspectra were recorded by Renishaw inVia Raman Microscope. Excitation source is a helium neon laser (λ= 633 nm) with power equal to 50Wt. Anti-Stokes luminescence of erbium ions was registered in spectral region of 450–750 nm at room temperature (excitation laser wavelength is 975 nm, power is 1Wt). Main Results. It was shown that the structure of the initial glass does not change with the introduction of niobium as Nb₂O₅ in any coordination plays a role of network forming, building a single mixed grid with tetrahedrons [GeO₄]. Introduction of the second glass former P₂O₅ leads to loosening germanate structure due to the appearance of the phosphate sublattice. This leads to a redistribution of the relative intensity of up-conversion luminescence bands with maxima at 540 and 670 nm compared with the initial glass. Introduction of additives PbO, MgO, Al₂O₃, TiO₂ results in a multicenter structure. In case of titanium oxide addition it leads to a change in the relative intensities of the erbium luminescence. 

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