Improved Infrared Emissions of Er3+-Tm3+ Co-Doped Al2O3 Thin Films: The Role of Cross Relaxation Among Rare Earth Ions
Abstract:We report the infrared emissions of Er3+-Tm3+ co-doped amorphous Al2O3 thin films pumped at 791 nm by a Ti:sapphire laser. The as-deposited films were annealed to improve the photoluminescence performance. Three cross relaxation channels among Er3+-Tm3+ and Tm3+-Tm3+ ions incorporated in the films were investigated as annealing temperature increases especially from 800 to 850 °C. In order to understand the Stark effect and cross relaxations, the photoluminescence spectra were deconvoluted by Gaussian fittings. Our results indicate that the luminescence intensity of 1.62 μm in comparison to 1.5 μm can be enhanced by the cross relaxation process [Er3+(4I13/2)+Tm3+(3H6) → Er3+(4I15/2)+Tm3+(3F4)], and the longer-wavelength side of Er3+ emission can be improved by the CR process [Er3+(4I15/2)+Tm3+(3H4 → Er3+(4I13/2)+Tm3+(3F4)] at expense of the Tm3+ 1.47 μm emission which is also maybe quenched by the CR effect between themselves. These results suggest one possible approach to achieve broadband infrared emissions at the wavelength region of 1.45–1.65 μm from the Er3+-Tm3+ co-doped systems.
Document Type: Research Article
Publication date: 2011-12-01
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