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Spectrum study and photochemistry mechanisms. (a) UV‐Vis absorption spectra of IR783/BC NPs upon 530 nm light irradiation. Fluorescence spectra of (b) IR783/BC NPs and (c) free IR783 upon 530 nm light irradiation (Ex. 783 nm). (d) Photocleavage process of BC prodrug. (e) ROS‐triggered decomposition of IR783. The LC‐MS characterization of intermediates and products ①–⑧ is showed in Figure S8. Light irradiation: 530 nm, 50 mW/cm2
