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. 2021 Aug 31;11(46):29065–29072. doi: 10.1039/d1ra04431a

Fig. 2. TEM images and DLS particle size distribution of (A) UCNPs, (B) UCNPs@Bi, (C) UCNPs@Bi@SiO2, (D) UCNPs@Bi@SiO2 lips. (E) Element mapping of UCNPs@Bi@SiO2. Scale bars in figure (A), (B), (C), (E), and inset in (D) are 50 nm. (F) XRD patterns of UCNPs@Bi@SiO2.

Fig. 2