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Upconversion(UC)phosphor Tm~(3+)doped YF_3 nano-crystals were prepared by hydrothermal method under different conditions and characterized by Field Transmission electron microscopy(TEM),Scanning electron microscopy(SEM)and X-ray diffraction(XRD).Their UC luminescence properties were studied by fluorescence spectrophotometer with 980 nm diode laser excitation,and impact of different grain sizes and morphology on the UC luminescence intensity was discussed.The fluorescence decay lifetime was calculated by Multi-exponential function fitting method.Results show that UC emission intensity was enhanced with the reduction of grain size,and the decay lifetime is 0.60 us.
Upconversion (UC) phosphor Tm ~ (3+) doped YF_3 nano-crystals were prepared by hydrothermal method under different conditions and characterized by Field Transmission electron microscopy (TEM), Scanning electron microscopy (SEM) and X-ray diffraction. Their UC luminescence properties were studied by fluorescence spectrophotometer with 980 nm diode laser excitation, and impact of different grain sizes and morphology on the UC luminescence intensity was discussed. The fluorescence decay lifetime was calculated by Multi-exponential function fitting method. Results show that UC emission intensity was enhanced with the reduction of grain size, and the decay lifetime is 0.60 us.