An All-in-One Organic Semiconductor for Targeted Photoxidation Catalysis in Hypoxic Tumor.

Tumor hypoxia severely limits the therapeutic effects of photodynamic therapy (PDT). Although many methods for oxygen generation exist, substantial safety concerns, spatiotenporal uncontrollability, limited efficacy, and complicated procedures have compromised their practical application. Here, we demonstrate a biocompatiable all-in-one organic semiconductor to provide a photoxidation catalysis mechanism of action. A facile method is developed to produce gram-level C5 N2 nanoparticles (NPs)-based organic semiconductor. Under 650 nm laser irradiation, the semiconductor split water to generate O2 and simultaneously produce singlet oxygen (1 O2 ), showing that the photocatalyst for O2 evolution and the photosensitizer (PS) for 1 O2 generation could be synchronously achieved in one organic semiconductor. The inherent nucleus targeting capacity endows it with direct and efficient DNA photocleavage. These findings pave the way for developing organic semiconductor-based cancer therapeutic agents.