期刊
JOURNAL OF SOLID STATE CHEMISTRY
卷 180, 期 8, 页码 2268-2272出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2007.05.032
关键词
up-conversion fluorescence; La0.78Yb0.20Er0.02F3/SiO2; core/shell; colloidal; nanocrystals
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. (C) 2007 Elsevier Inc. All rights reserved.
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