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. Author manuscript; available in PMC: 2021 Nov 1.
Published in final edited form as: Adv Drug Deliv Rev. 2020 Jun 29;156:188–213. doi: 10.1016/j.addr.2020.06.020

Fig. 20.

Fig. 20.

Schematic illustration of NIR light-triggered dox release by making use of the upconversion properties of UPNCs and trans–cis photoisomerization of azobenzene molecules grafted on a mesoporous silica layer. (Adapted from ref. 373).