Synthesis and green up-conversion fluorescence of colloidal La0.78Yb0.20Er0.02F3/SiO2 core/shell nanocrystals

Yan Wang, Weiping Qin, Jisen Zhang, Chunyan Cao, Jishuang Zhang, Ye Jin, Peifen Zhu, Guodong Wei, Guofeng Wang, Lili Wang

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

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 languageEnglish
Pages (from-to)2268-2272
Number of pages5
JournalJournal of Solid State Chemistry
Volume180
Issue number8
DOIs
StatePublished - Aug 2007
Externally publishedYes

Keywords

  • Colloidal
  • Core/shell
  • LaYbErF/SiO
  • Nanocrystals
  • Up-conversion fluorescence

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