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. 2023 Mar 13;13(3):376. doi: 10.3390/bios13030376

Figure 5.

Figure 5

(A) Synthetic procedure for Ag@SiO2@Y2O3:Er nanostructures and TEM images of the resulting UCNPs [78]. (B) Design of a NaGdF4:Yb3+, Nd3+@NaGdF4:Yb3+, Er3+@NaGdF4 UCNC allowing for two different energy transfer paths [86]. Reprinted with permission from [78,86].