Fig. 3

UV–Vis absorption spectra of BPQDs and BPQDs-DOX@OPM at different time points and the corresponding temperature rise curve. a Absorption spectra of BPQDs at 0, 2, 4, 6, and 8 days; b absorption spectra of BPQDs-DOX@OPM at 0, 2, 4, 6, and 8 days; c statistical analysis of the absorbance of BPQDs at 808 nm at different time points; d statistical analysis of the absorbance of BPQDs-DOX@OPM at 808 nm at different time points; e temperature rise curves of BPQDs on days 0, 2, 4, 6, and 8 days; f temperature rise curves of BPQDs-DOX@OPM on days 0, 2, 4, 6, and 8 days