Fig. 2.

A. Mechanistic diagram of CeCyan generating oxygen and ¹O₂ by CeCyan under 660 ​nm laser [64]. B. Schematic illustration of HSA/ICG conjugated Syne as an in situ photocatalyzed oxygen generation system for metastatic tumor immunogenic PDT [65]. C. Schematic illustration of S–UCNP–Ce6 for enhanced PDT of hypoxic tumors [6]. D. The CeCyano-based 3D printed CaCO₃-PCL scaffold was used for enhanced PDT of osteosarcoma [66]. Adapted with permission from Ref. [64] Copyright 2019, Wiley-VCH; adapted with permission from Ref. [65] Copyright 2020, Wiley-VCH; adapted with permission from Ref. [6] Copyright 2020, Springer Nature; adapted with permission from Ref. [66] Copyright 2021, Elsevier.