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Comparative analysis on optical properties between two glass series (a-ordinary glass, bglass with nanoparticles) have been estimated. The two glass series (a-ordinary glass, bglass with nanoparticles) with compositions {[(TeO2)0.70 (B2O3)0.30]0.70 (ZnO)0.30}1−y (Er2O3/Er2O3 nanoparticles)y; y = 0.005, 0.01, 0.02, 0.03, 0.04, 0.05 mol% were successfully prepared by using melt-quenching method. The TEM, EDX and XRD have been used to confirm the existence of nanoparticles and all elements in the glass system. The density of b-glass with nanoparticles are found greater than a-ordinary glass. The optical properties of the glass series were characterized by using Ellipsometer and UV-Vis spectrophotometer. There is a linear increasing trend in refractive index of the glass series along with concentration of erbium and erbium nanoparticles oxide. The refractive index of b-glass with nanoparticles is greater than a-ordinary glass. Moreover, the absorption peaks of a-ordinary glass are more intense than b-glass with nanoparticles. The glass with nanoparticles will offer a potential materials for nanophotonic devices.

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The zinc borotellurite doped with dysprosium oxide glass samples with chemical formula {[(TeO2)0.7(B2O3)0.3]0.7(ZnO)0.3}1−x(Dy2O3)x (where x=0.01, 0.02, 0.03, 0.04 and 0.05 M fraction) were prepared by using conventional melt quenching technique. The structural and optical properties of the proposed glass systems were characterized by using Xray diffraction (XRD) spectroscopy, Fourier Transform Infrared (FTIR) spectroscopy, and UV-VIS spectroscopy. The amorphous nature of the glass systems is confirmed by using XRD technique. The infrared spectra of the glass systems indicate three obvious absorption bands which are assigned to BO 3 and TeO 4 vibrational groups. Based on the absorption spectra obtained, the direct and indirect optical band gaps, as well as the Urbach energy were calculated. It is observed that both the direct and indirect optical band gaps increase with the concentration of Dy 3+ ions. On the other hand, the Urbach energy is observed to decrease as the concentration of Dy 3+ ions increases.