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TEM micrographs of the synthesized NaYF4;Yb,Er nanoparticles (A) and NaYF4;Yb,Er@SiO2 nanoparticles (B). (C) HRTEM image of a NaYF4;Yb,Er@SiO2 nanoparticle. (D) Magnification of the image in (C). The scale bars in (A) and (B) are 50 nm, whereas in (C) and (D) they are 10 and 5 nm, respectively.
