Abstract
Uniform NaYF4∶18%Yb,0.5%Tm nanocrystals were synthesized via thermal decomposition method following high temperature,and then a change of the nanocrystals was made from oil-soluble to water-soluble by ligand-exchanged method.X-ray diffraction(XRD) analyses showed that the samples were β-NaYF4 nanocrystals.The TEM images exhibited that the nanocrystals had an average size of 35 nm.Under 980 nm near-infrared laser excitation,the samples showed intense ultraviolet upconversion emission.5-photon upconversion fluorescence of the Tm3+ ions in the nanocrystals was stronger than 4-photon and 3-photon upconversion fluorescence.Due to special optical properties and small size,the water-soluble nanocrystals would show potential applications in the biomedical field.
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