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(a) Schematic illustration of the synthesis of photodegradable hydrogel‐coated UCNPs and drug release mechanism. (b) Cumulative FITC‐BSA release from the NGs as a function of irradiation time at different laser powers (left) and under NIR laser irradiation ON/OFF cycles (right).Reprinted with permission from Jalani et al. (2016). Copyright 2016. American Chemical Society
