Abstract
Water-soluble PVP-stabilized hexagonal-phase La0.78Yb0.20Er0.02F3 nanocrystals (NCs) were synthesized by hydrothermal method. The NCs were coated with a very thin silica shell, and amino groups were introduced to the surface of silica shells by copolymerization of 3-aminopropyl(triethoxy)silane. The core/shell NCs can be dispersed in ethanol and water to form stable colloidal solution. The transmission electron microscopy (TEM), selected area electron diffraction (SAED), powder X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FT-IR) were used to characterize the core/shell materials. In addition, the green up-conversion fluorescence mechanism of La0.78Yb0.20Er0.02F3/SiO2 NCs was studied with a 980-nm diode laser as excitation source. The water solubility, small core/shell particles size, and well colloidal stability mean the green up-conversion fluorescence NCs have potential applications in bioassay.
Original language | English |
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Pages (from-to) | 2268-2272 |
Number of pages | 5 |
Journal | Journal of Solid State Chemistry |
Volume | 180 |
Issue number | 8 |
DOIs | |
State | Published - Aug 2007 |
Externally published | Yes |
Keywords
- Colloidal
- Core/shell
- LaYbErF/SiO
- Nanocrystals
- Up-conversion fluorescence