Abstract
The emission spectra and the lifetime of the lasing transition 4I 13/2→ 4I 15/2 in Er 3+-doped TeO 2-ZnO binary glass have been studied. The investigation includes Raman scattering spectroscopy as well as optical absorption, luminescence, and lifetime measurements techniques. The influence of erbium concentration on the line-shape of this electron transition has been analyzed. It was observed that the increasing of Er 3+ ion concentration, in the 0.2–4 mol% range, results in a structural changes and a significant spectral broadening of the 1.53 μm emission band. Reabsorption has been evoked to explain the broadening of the 4I 13/2→ 4I 15/2 emission line. In the paper, is also reported the effect of the erbium content on the emission intensity of the 4I 13/2→ 4I 15/2 transition as well as on the lifetime of the 4I 13/2 level. Based on the electrical–dipole interaction theory, the luminescence concentration quenching mechanism by hydroxyl groups is analyzed. The data suggest that <10% of hydroxyl groups are coupled to erbium ions in the zinc tellurite glass network.
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