Study of optical and physical properties of Erbium (Er3+) doped Zinc Boro-Tellurite glasses
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Date
2019-08
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
In present investigation, optical and physical properties of Erbium doped Zinc Boro-tellurite glasses were studied. This particular glass matrix can be used in telecommunication devices, laser fiber, EDFA and photonics application. Erbium doped Zinc Boro-tellurite glass system (EZBT) have been prepared by conventional melt quenching technique with molar composition of (55-x)TeO2- 20ZnO- 25B2O3-xEr2O3 (x = 0, 0.5, 1, 1.5 and 2 mol%). The physical, structural and optical properties are studied by analyzing the data obtained from characterization techniques i.e. Standard displacement technique, X-ray diffraction (XRD), Fourier transform infrared (FTIR) and UV-Vis spectroscopy. The obtained physical parameters like density and molar volume are found to vary linearly with increasing Er2O3 content. The amorphous nature of glass samples was confirmed by the XRD technique. FTIR spectroscopy revealed the presence of BO3, TeO4, BO4 and TeO3 stretching and vibration groups in glass samples. The optical absorption spectra of Er3+ ions in these glasses were recorded by UV-Vis spectroscopy. It was found that the optical band gap decreases and Urbach energy increases with the increase of Er3+ ion content. The refractive index, polarizability, metallization criterion, dielectric constant and susceptibility of these glass samples were also calculated. Judd-Ofelt parameters (Ω2, Ω4, Ω6) were derived with the help of optical absorption spectra. These parameters are used to calculate radiative transition probabilities, life time and branching ratio for Erbium energy level. Our detailed and systematic study provides useful information towards the applications using Er3+ doped Zinc Boro-tellurite glasses in different telecommunication devices.
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