Fabrication of Upconverting Hybrid Nanoparticles for Near-Infrared Light Triggered Drug Release

Figure 6

(a) TEM micrographs of the NaYF₄:Tm³⁺ 0.5 mol%, Yb³⁺ 30 mol%@ NaYF₄ core/shell UCNPs; (b) emission spectra of UCNPs under 980 nm NIR excitation (8 W).

(a)

(b)