Fig. 2

a ROS generation of PYT NPs mixed with DPBF under laser power density (808 nm laser, 1.0 W cm⁻²). b The absorption intensity of DPBF mixed with ICG or PYT NPs solution at 415 nm. c The images of intracellular ROS and d mitochondrial ROS detected in 4T1 cells treated with PBS, NIR, PYT NPS or PYT NPs + NIR. Scale bar: 100 μm