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(A) TEM micrograph of as-synthesized β-NaY0.79F4:Yb0.19,Er0.02. (B) TEM micrograph of monodisperse β-NaY0.79F4:Yb0.19,Er0.02@SiO2. (C) PL emission of β-NaY0.79F4:Yb0.19,Er0.02@SiO2 nanoparticles upon illumination with a 980 nm CW laser. (D) Photograph taken from a dispersion of NaYF4:Yb,Er@SiO2 in an NMR tube illuminated with a 980 nm CW laser from the bottom.
