Fig. 7
The confocal fluorescence microscopy images of HeLa cells under 405 nm excitation after treatment with 50 μg/mL of pure CQDs (a–c), PtPor (d–f), and CQDs@PtPor (g–i) for 24 h. a, d, g Bright field. b, e, h The CQDs imaging channel, detected at the wavelength region of 410–450 nm. c, f, i The PtPor imaging channel, detected with the 590 nm long pass region; (scale bar = 20 μm)