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Keywords:

  • fluorescence;
  • bioimaging;
  • nanocrystals;
  • core/shell nanoparticles;
  • quantum dots
Thumbnail image of graphical abstract

Core/shell-structured silica/NaYF4 nanospheres featuring uniform silica coatings are synthesized using a facile, user-friendly method. Multicolor nanospheres are produced by encapsulation of organic dyes or quantum dots in the silica shell, and upconversion fluorescence is generated based on fluorescence resonance energy transfer (FRET).