Affiliation:
1. Universiti Teknologi Malaysia
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-1for different B-O and Te-O vibrational groups. The UV-VIS-IR spectra exhibits seven absorption bands corresponding to the transitions from4I15/2ground state to4I13/2,4I11/2,4I9/2,4F9/2,2H11/2,4F7/2and4F3/2excited 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
Publisher
Trans Tech Publications, Ltd.
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