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(a) Normalized absorption spectra and TEM images of NaYF4: 30%Yb, 0.5%Er/NaYF4 nanoparticles (Yb-UCNPs) and NaYF4: 30%Yb, 0.5%Er, 1%Nd/NaYF4: 20%Nd nanoparticles (Nd-UCNPs). Schematics of (b) cell-in-celldish model and (c) three-layer pork tissue model.
