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Under 980 nm near‐infrared (NIR) excitation, upconversion luminescent (UCL) emission of GdF3:Yb,Er upconversion nanoparticles (UCNPs) synthesized by a simple and green hydrothermal process can be tuned from yellow to red by varying the concentration of dopant Li+ ions. A possible mechanism for enhanced red upconverted radiation is proposed. A layer of silica was coated onto the surface of GdF3:Yb,Er,Li...
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