Figure 5.

(A) Precise tumor targeting and specific PDT for cancer of UCNPs@PAA-DNA. In vivo imaging of five major organs harvested from a mouse at 8 h postinjection with UCNPs@PAA-DNA1(Ce6) (left) or UCNPs@PAA-DNA1/2 (right). Adapted with permission from ¹⁴⁷, Copyright 2018, Royal Society of Chemistry. (B) Upper: NIR light‐triggered Dox release by making use of the upconversion property of UCNPs and trans-cis photoisomerization of azo molecules grafted in the mesopore network of a mesoporous silica layer. Down: CLSM observations of the photocontrolled Dox release in HeLa cells. Adapted with permission from ¹⁴⁵, Copyright 2013, John Wiley & Sons, Inc.