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We demonstrate a soft liquid-phase adsorption technique for the fabrication of upconversion luminescent layers consisting of rare-earth-doped ceramic nanoparticle films on wettability-patterned flexible plastic sheets. Visible upconversion luminescence and near-infrared fluorescence were observed under excitation at 980nm in the Ho3+- and Yb3+-codoped-NaYF4 nanoparticles prepared by hydrothermal technique...
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