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. Author manuscript; available in PMC: 2013 Sep 25.
Published in final edited form as: ACS Nano. 2012 Sep 4;6(9):8280–8287. doi: 10.1021/nn302972r

Figure 1.

Figure 1

Successful epitaxial growth of CaF2 shells on NaYbF4:0.5% Tm3+ core nanoparticles, resulting in uniform and monodispersed (NaYbF4:0.5% Tm3+)/CaF2 core/shell nanoparticles. Transmission electron microscopy images of a) NaYbF4:0.5% Tm3+ core and b) (NaYbF4:0.5% Tm3+)/CaF2 core/shell nanoparticles. c) High-angle annular dark-field scanning transmission electron microscopy image of (NaYbF4:0.5% Tm3+)/CaF2 nanoparticles with resolved core/shell structures; both the core (bright) and the shell (dark) are clearly visible. d) Powder x-ray diffraction patterns of NaYbF4: 0.5% Tm3+ core and (NaYbF4: 0.5% Tm3+)/CaF2 core/shell particles.