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. 2022 May 2;3(4):544–556. doi: 10.1016/j.fmre.2022.03.025

Fig. 4.

Fig 4

(a) Schematic illustration of the synthesis process of UCNPs@SiO2 labeled with MET/MOP-MAbs. TEM images of (b) NaYF4:Yb, Er@NaYF4(UCNPs) and (c) UCNPs@SiO2. It can be seen that the prepared UCNPs have a hexagonal phase structure with homogeneous size, which is consistent with the results obtained by XRD. Moreover, the prepared UCNPs did not show agglomeration, which indicates that the synthesized UCNPs have good dispersion.