Photoluminescence from Er3+ ion and SnO2 nanocrystal co-doped silica thin films |
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Authors: | Xiaowei Zhang Tao Lin Xiaofan Jiang Jun Xu Jianfeng Liu Ling Xu and Kunji Chen |
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Affiliation: | 1 School of Electronic Science and Engineering, School of Physics, Nanjing University, Nanjing 210093, China 2 Joint Research Centers Online of Solid State Microstructure, Network and Information Center, Nanjing 210093, China |
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Abstract: | Er3+ ions embedded in silica thin films co-doped by SnO2 nanocrystals are fabricated by sol-gel and spin coating methods. Uniformly distributed 4-nm SnO2 nanocrystals are fabricated, and the nanocrystals showed tetragonal rutile crystalline structures confirmed by transmission electron microscope and X-ray diffraction measurements. A strong characteristic emission located at 1.54 μm from the Er3+ ions is identified, and the influences of Sn doping concentrations on photoluminescence properties are systematically evaluated. The emission at 1.54 μm from Er3+ ions is enhanced by more than three orders of magnitude, which can be attributed to the effective energy transfer from the defect states of SnO 2 nanocrystals to nearby Er3+ ions, as revealed by the selective excitation experiments. |
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