Abstract
Nanopowders of langasite (La3Ga5SiO14) doped with 1 at.% Er3+ and 3 at.% Yb3+ were synthesized for the first time by a modified Pechini route and annealed in air at 700, 750, 800, 900, and 1,000 °C. The langasite powders were characterized by XRD, FTIR and luminescence techniques. Crystallization began at 750 °C and pure langasite phase was obtained for the samples annealed at 800 and 900 °C. Traces of LaGaO3 and Ga2O3 were observed in the sample annealed at 1,000 °C. Bright green and red luminescence was observed for pumping at 973 nm whose intensity increased with annealing temperature due to the removal of the adsorbed impurities and the improvement of crystallinity.
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