Optical spectroscopy of rare earth-doped oxyfluoro-tellurite glasses to probe local environment

Honnavar, Gajanan V and Ramesh, K P (2017) Optical spectroscopy of rare earth-doped oxyfluoro-tellurite glasses to probe local environment. In: BULLETIN OF MATERIALS SCIENCE, 40 (5). pp. 991-997.

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Abstract

TeO2-based glasses with a general formula 65TeO(2)-5BaF(2)-30ZnF(2) (TBZ) (in mol%) were prepared by usual melt quenching technique. Three mol% of europium (Eu) or erbium (Er) were added to the prepared glass at the expense of TeO2. Raman, photoluminescence (PL), UV-visible absorption studies were carried out on the glass samples. Raman spectra of the undoped and doped glasses were analysed using the peak shift and the intensity variation along with full width at half-maximum (FWHM). It was found that Eu-doped TBZ glass has a greater tendency towards depolymerizing the glass matrix by influencing the conversion of TeO4 to TeO3 units compared to Er-doped and undoped glasses. PL spectra of the glass samples show emission due to different possible transitions. Position of the peak of the de-convoluted spectra shows the position of the particular Stark component and the FWHM is a measure of the inhomogeneous broadening. The UV-visible absorption spectra are used to calculate the optical density and to determine the band edge of the glass samples by fitting to the Mott equation. It is seen that Eu-doped TBZ glass has a lesser bandgap than that of Er-doped glass.

Item Type:	Journal Article
Publication:	BULLETIN OF MATERIALS SCIENCE
Additional Information:	Copy right for this article belongs to the INDIAN ACAD SCIENCES, C V RAMAN AVENUE, SADASHIVANAGAR, P B #8005, BANGALORE 560 080, INDIA
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	07 Oct 2017 06:06
Last Modified:	07 Oct 2017 06:06
URI:	http://eprints.iisc.ac.in/id/eprint/57989

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