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ARTICLE

Structural and spectroscopic correlation in barium-boro-tellurite glass hosts: effects of Dy₂O₃ doping

S. F. Hathot^a,*, B. M. Al Dabbagh^a, H. Aboud^b

a Applied Science Dep, University of Technology, Baghdad, Iraq
b Faculty of science- physics Dep, college of Science, Al-Mustansiriya University, Iraq

* Corresponding Author:

Chalcogenide Letters 2024, 21(2), 201-215. https://doi.org/10.15251/CL.2024.212.201

Received 23 November 2023; Accepted 22 February 2024;

Abstract

In this study, a series of barium-boro-tellurite glass hosts with varying concentration of Dy₂O₃ doping (0 to 1.25 mol%) were made by melt-quenching method. A study was conducted to investigate how Dy₂O₃ dopants affect the physical and spectroscopic traits of glasses. Raw materials including barium oxide (BaO), tellurium dioxide (TeO₂), boron oxide (B₂O₃), and dysprosium oxide (Dy₂O₃) were used to produce these glasses. XRD patterns of the samples showed a broad hump and absence of long-range periodic lattice arrangements, indicating their amorphous nature. The Raman spectral analyses displayed the various vibration modes where the most intense band caused by BaO vibrations at 300 cm^-1 and 450 cm^-1 corresponding to the symmetric stretching vibration mode of Te–O–Te intra-chain bridges. The peak at 750 cm^-1 was due to TeO₄ and Te-O-Te vibration modes. The value of optical band gap energy was decreased from 3.155 to 2.1894 eV and then increase at higher Dy₂O₃ level (0.75 to 1.25 mol%). At Dy³⁺ contents between 0.25 to 1.25 mol% seven absorption bands were observed at 390, 424, 452, 750, 797, 895 and 1092 nm due to the electronic transitions in Dy³⁺. The glass refractive indices were raised from 2.3563 to 2.6584 and then decreased at higher Dy₂O₃ contents which was mainly because of the generation of more bridging oxygen (BO) in the glass matrix. The value of glass electronic polarizability and oxide ions polarizability calculated using Lorentz-Lorenz equation showed a decrease with the rise of Dy₂O₃ contents, which was ascribed to the presence of fewer non-bridging oxygen (NBO). The optical basicity of the proposed glass hosts was calculated using Duffy and Ingram equation which was decreased with the increase of doping contents. In addition, the optical transmission was increased and reflection loss was reduced with increasing Dy⁺³ levels. The value of metallization parameter below 1 proved the true amorphous nature of the prepared samples. All the glasses revealed blue and yellow photoluminescence emission peaks due to 4F9/2→ 6H15/2, and 4F9/2 →6H13/2 transitions in Dy³⁺, respectively. The proposed glass compositions may be beneficial for the advancement of solid-state lasers.

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Keywords

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