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Improved Infrared Emissions of Er3+-Tm3+ Co-Doped Al2O3 Thin Films: The Role of Cross Relaxation Among Rare Earth Ions

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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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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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