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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. 18.

Fig. 18.

NIR excitation (980 nm) of the UCNPs resulted in upconverted UV emission at 364 nm used for photocleavage subsequent release of 5-fluorouracil from the UCNP surface. (Adapted from ref. 355).