Figure 2
From: Core – shell upconversion nanoparticle – semiconductor heterostructures for photodynamic therapy
Structural characterization.
XRD patterns of (a) core UCN before coating and (b) UCN@ZnO CSNPs. (c) High-resolution TEM and (d) STEM images of CSNPs. (e) TEM and elemental mapping of CSNPs by STEM. The brightness of the image represents the concentration of the element.
