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摘要
The Nd3+-sensitized Ca2+-doped NaYF4: Yb/Tm/Ca@NaGdF4: Nd/Yb core/shell upconversion nanoparticles were successfully prepared by solvothermal method. The effects of key factors such as the content of sensitizers Nd3+ and Yb3+ and the excitation power on the fluorescence performance were studied for the blue light and UV up-conversion emission generated in the Tm3+ multi-photon process. To obtain up-converting nanoparticles with good hydrophilicity, the UCNPs surface was modified with mesoporous silica(mSiO2). Its morphology, structure and fluorescence properties were characterized by TEM, XRD, FT-IR and fluorescence spectroscopy. The results showed that the prepared nanoparticles were pure hexagonal phase, the surface was evenly modified with a layer of mSiO2. Then, under the excitation of 808 nm near infrared light, when the mole fraction of Nd3+ and Yb3+ in the shell was 50% and 10% respectively, it shows strong up-conversion blue light(1D2→3F4, 1G4→3H6) and ultraviolet light(1I6→3F4, 1D2→3H6). The research will have potential application prospects in photodynamic therapy and fluorescence imaging.
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