1：Experimental Design and Method Selection:

The study investigates the excitation power-dependent PL blinking of individual 3C–SiC NCs using confocal microscopy and FFT analysis to determine switching frequencies, based on the Auger photon-ionization model.

2：Sample Selection and Data Sources:

3C–SiC NCs were synthesized via chemical corrosion of commercial 3C–SiC powder, with sizes ranging from 2 nm to 6 nm. Single NCs were isolated by dilution and spin-coating onto glass slides.

3：List of Experimental Equipment and Materials:

Equipment includes a Shimadzu UV-2600 spectrometer, FS5 PL spectrometer (Edinburgh Instruments), confocal microscope (LSM780, Carl Zeiss), Ar ion laser (488 nm excitation), and centrifugation apparatus. Materials include 3C–SiC powder (Alfa Aesar Co., Inc.), nitric acid, hydrofluoric acid, deionized water, and glass slides.

4：Experimental Procedures and Operational Workflow:

NCs were prepared by etching, centrifugation, washing, and ultrasonic dispersion. Ensemble PL and absorption spectra were measured. Single NC PL trajectories were recorded using confocal microscopy with varying excitation powers (5–50 μW), and FFT was applied to analyze blinking frequencies.

5：Data Analysis Methods:

FFT was used to determine PL switching frequencies from time trajectories; linear fitting assessed PL intensity vs. power; Gaussian fitting separated on/off states in intensity histograms.