Fig. 1

Characterization of BPQDs@H, EGCG@H, EGCG-BPQDs@H. A HRTEM images and B DLS size distribution of EGCG-BPQDs; the insert in A is the image of one single magnified BPQD. C FTIR spectra, D XRD, E UV–vis and F fluorescence emission (λex = 400 nm) of samples. G The temperature rises curves of four groups of samples within 5 min. H The thermal curves of BPQDs@H and EGCG-BPQDs@H after repeated laser irradiation (n = 3). I Infrared thermography images of samples under 808 nm laser irradiation for 5 min. J ABDA solution containing EGCG-BPQDs@H after irradiation for different times. K The ESR spectra of BPQDs@H and EGCG-BPQDs@H after being in the dark or irradiated with light for 10 min