Figure 5.

(a) Schematic of the phase transfer procedure using Pluronic F-127 as encapsulation material. (b) Emission spectra of dye-sensitized core/Yb³⁺ shell UCNPs (1 mg/mL) before micelle encapsulation in DMF (black curve) and after encapsulation in PBS (red curve), acquired upon 800 nm CW laser excitation (2 W/cm²). The inset displays photographs of micelle-encapsulated dye-sensitized core/Yb³⁺ shell UCNPs dispersed in PBS with and without 800 nm CW laser excitation obtained by an Apple iphone 5S camera.