We report on the synthesis and a detailed spectroscopic study of an Er3+ -doped “mixed” (Lu,Y,La)2O3 transparent sesquioxide ceramic. Nanopowders of the composition (Lu0.63Y0.25La0.05Er0.07)2O3 were obtained by a glycine-nitrate self-propagating high-temperature synthesis. The ceramics were obtained by vacuum sintering at 1750 °C for 3 hours. La2O3 acted as a sintering additive and increased the disorder of the sesquioxide lattice. The ceramic had a cubic (C-type) structure. At 1.05 μm, its transmission was 78.9%. The ceramic exhibited intense mid-infrared emission owing to the 4 I11/2 → 4 I13/2 Er 3+ transition. The corresponding peak stimulated-emission cross-section σSE is 1.12×10-20 cm2 at 2717 nm. The luminescence spectrum exhibited a considerable inhomogeneous broadening as compared to the parent compounds, Er:Lu2O3 and Er:Y2O3. The luminescence lifetimes of the 4 I11/2 and 4 I13/2 manifolds were measured (1.99 ms and 3.35 ms, respectively), representing a favorable ratio for mid-IR laser operation. The crystal-field splitting of Er3+ multiplets in C2 sites was determined at low temperature.
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