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期刊论文
Synthesis and Characterization of High-Efficiency Nanocrystal Up-Conversion Phosphors: Ytterbium and Erbium Codoped Lanthanum Molybdate
Chem. Mater. 2002, 14, 2910～2914，-0001，（）：
Nanocrystal up-conversion phosphors (UCP), ytterbium- and erbium-codoped lanthanum molybdate (La2(MoO4)3:Yb,Er), were prepared for the first time for potential uses in bioassays especially in biochip-based analysis. The La2(MoO4)3:Yb,Er nanocrystals, with an average diameter of 50nm, were prepared via a hydrothermal method. After being annealed at 800℃ for 5h, strong emission of these nanocrystals was observed when excited with a 980nm infrared (IR) laser. Fluorescent intensity of these nanocrystals is much stronger than that of bulk materials. Down-conversion spectrum of the nanocrystal phosphors was also examined. Two-photon excitation mechanism was proposed for the up-conversion process. Factors affecting the up-conversion fluorescent intensity were also studied. The particlesizedependent phenomenon was first observed for nanocrystal UCP, and the mechanism was discussed.
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