Influence of Er³⁺ Dopants on Optical Properties of Boro-Tellurite Glass

Abstract:

The effect of the rare earth ion concentration on the physical and spectroscopic properties of Er³⁺-doped boro-tellurite glass is studied. Glasses with compositions 30B₂O₃+10ZnO+(60-x)TeO₂+xEr₂O₃ (where x=0, 0.5, 1, 1.5 and 2mol%) are prepared by melt-quenching method. The structural analyses are made through XRD, FTIR and UV-VIS-IR absorption spectroscopy. IR-spectra reveal five absorption bands in the region of 450-1500 cm^-1 for different B-O and Te-O vibrational groups. The UV-VIS-IR spectra exhibits seven absorption bands corresponding to the transitions from ⁴I_15/2 ground state to ⁴I_13/2, ⁴I_11/2, ⁴I_9/2, ⁴F_9/2, ²H_11/2, ⁴F_7/2 and ⁴F_3/2 excited states. The bonding parameters are determined from the optical absorption spectra and are found to be covalent in nature. The optical band gap energy values corresponding to the direct and indirect allowed transitions decreases while the Urbach energy and cut-off wavelengths increases by the introduction of Er³⁺ ions. Keywords: Er³⁺ ions, melt-quenching, boro-tellurite glass, optical band gap

• Periodical: Advanced Materials Research (Volume 895)
• Pages: 211-215
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.895.211
• Online since: February 2014
• Authors: Zahra Ashur Said Mahraz, M.R. Sahar, Sib Krishna Ghoshal
• Keywords: Boro-Tellurite Glass, Er³⁺ Ions, Melt-Quenching, Optical Band Gap

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