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Er3+-Tm3+ codoped amorphous Al2O3 thin films were synthesized using pulsed laser deposition and their photoluminescence (PL) properties were investigated. The infrared fluorescence was improved by post-annealing and a broadband emission was obtained. Three cross relaxation channels between Er3+-Tm3+ and Tm-Tm ions were observed for the films with annealing temperature increased from 800 to 850??C,...
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