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7 September 2011 Gd3+ and S2+ sensitizer effect on the upconversion emission of ZrO2:Yb3+, Er3+ nanocrystals prepared by precipitation method with a hydrothermal process
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Abstract
In this work, it is presented the synthesis of ZrO2:Yb3+, Er3+ nanocrystals by precipitation method with a hydrothermal process and annealing at 1000 °C. Samples were prepared with 2 mol% of Yb3+ and 1mol% of Er3+, and sensitized with different concentration of Gd3+ and S2+. The ceramic powders were characterized with different techniques to determine their chemical composition, crystalline structure, crystallite size, morphology and upconversion emission. All samples present the tetragonal crystalline phase with crystallite size lower than 70 nm with cubic shape. Experimental results suggest the presence of SO4 on the surface of nanocrystals reducing the OH's and then improving the signal emitted. The nanocrystals presented strong upconversion emission enhanced by the presence of both sensitizer Gd3+ and S2+. A synergistic effect was observed with the combination of both sensitizers, improving the upconverted visible emission. The red emission peak centered at 655 nm dominates the signal emitted but the red/green intensity ratio can be changed by controlling the dopant composition.
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Alejandra Urbina-Frías, Elder De La Rosa, Tzarara López-Luke, Pedro Salas, Carlos Angeles-Chavez, and Alejandro Torres "Gd3+ and S2+ sensitizer effect on the upconversion emission of ZrO2:Yb3+, Er3+ nanocrystals prepared by precipitation method with a hydrothermal process", Proc. SPIE 8094, Nanophotonic Materials VIII, 80940R (7 September 2011); https://doi.org/10.1117/12.892872
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