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Ligand field and Judd-Ofelt intensity parameters of samarium doped tellurite glass

Tanko, Y. A. and Ghoshal, S. K. and Sahar, M. R. (2016) Ligand field and Judd-Ofelt intensity parameters of samarium doped tellurite glass. Journal of Molecular Structure, 1117 . pp. 64-68. ISSN 0022-2860

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Abstract

We report the samarium ions (Sm3+) contents dependent ligand field and Judd-Ofelt (JO) intensity parameters (Ω2, Ω4, Ω6) of zinc tellurite glass. The amorphous nature of the melt-quench synthesized glasses is confirmed using XRD. The lower energy region of the absorption spectra is used to calculate JO intensity parameters and the UV edge is exploited to determine the Nephelauxetic ratio, bonding, and Racah parameters. The Nephelauxetic ratio and Racah parameter is reduced and the bonding parameter is enhanced with the increase of Sm3+ concentration. The enhancement in covalency is found to increase the non-bridging oxygen and crystal field strength by delocalizing more d-shell electrons. Furthermore, Nephelauxetic function revealed an increase due to the reduction of localized d-electrons that is aroused from the overlap of d-orbital and ligand orbital. The JO intensity parameters displayed the Ω4>Ω6>2 trend. Increase in Ω2 and decrease in Ω2 and Ω2 with the increase of Sm3+ concentration indicated an increase in the Sm-O covalency and coordination in the asymmetry of the prepared glasses. The large vale of spectroscopic quality factor (greater than unity) makes the proposed glass system prospective for various optical devices fabrication.

Item Type:Article
Uncontrolled Keywords:Electromagnetic wave absorption, Ligands, Light absorption, Samarium, Tellurium compounds, Judd-Ofelt intensity parameters, Ligand field, Melt quenching techniques, Tellurite glass, UV-vis optical absorption, Glass
Subjects:Q Science > QC Physics
Divisions:Science
ID Code:72208
Deposited By: Fazli Masari
Deposited On:20 Nov 2017 16:18
Last Modified:20 Nov 2017 16:18

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