Fig. 3

Application of CQDs. A CLSM imaging of HeLa cells labeled with CQDs; B In vitro cytotoxicity test of CQDs; C Relative viability of HeLa cells incubated with control solution or CQDs (200 μg mL⁻¹) and exposed to blue light (460 nm, 30 mW cm⁻²) for 5 min, 10 min, and 15 min; D The IC50 of excited CQDs on Hela cells after exposure to blue light for 10 and 15 min (*P < 0.05)