Fig. 2: NIR relaxation dynamics and photothermal-thermoelectric catalytic mechanism of magnetic edge states.

2D pseudoo-color maps of the TA spectra of CQDs in a DMSO with a pump wavelength of 700 nm (1 kHz, 100 fs) and b H₂O with a pump wavelength of 550 nm (1 kHz, 100 fs). c Bleach signal kinetics of CQDs in DMSO collected at 1023 nm for λpump = 700 nm and H₂O collected at 1150 nm for λpump = 550 nm. Dots are the experimental points, and the solid lines are the fittings. d EPR spectra of CQDs (25 μg mL⁻¹) in DMSO solutions after 1064 nm laser irradiation for 0 min and 10 min. The signals of the six peaks in the spectra represent superoxide radicals, with DMPO acting as a radical scavenger in DMSO. e EPR spectra of CQDs (25 μg mL⁻¹) in aqueous solution after 1064 nm irradiation for 0 min and 10 min. TEMPO was used as a photoexcited high spin state electron scavenger to measure photoexcited electron production based on the extent of signal reduction. f Schematic energy level diagram of magnetic edge-state electrons under NIR light excitation. μ_e, electron mobility. μ_h, hole mobility. J_e, Current density. Source data are provided as a Source Data file.