Abstract
The Y2-xTe4O11 (x = 0.1, 0.5, 1.0, 2.0 and 5.0 at%) microcrystalline powders were successfully synthesized by a conventional solid state reaction method. Optical absorption (300 K) and fluorescence spectra (300 K) as well as fluorescence decay curves (300 K) of the emitting levels of Tm3+ ion in Y2Te4O11 powders are presented and analyzed in details. The Judd-Ofelt theory was applied to analyze experimental data for the quantitative determination of phenomenological Ωλ (λ = 2, 4, 6) parameters, radiative transition probabilities (A), branching ratios (β) of luminescence and radiative lifetimes (τrad) of the 1D2, 1G4, 3H4 and 3F4 levels. The observed non-exponential decays nature and concentration quenching of the 1G4 and 3H4 states have been attributed to cross-relaxation processes and this phenomena has been analyzed by Inokuti-Hirayama model. The stimulated emission cross-section for the 3F4 → 3H6 transition equals to 1.12 × 10−20 cm2 at 1809 nm was calculated using the Füchtbauer-Ladenburg method and compared with the corresponding values of other Tm3+-doped laser hosts. From obtained results, follow that the Tm3+:Y2Te4O11 is a potential candidate for a solid-state laser host operating at 1.8 µm.
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