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Fluorescence spectra of graphitic ( g -C 3 N 4 ) and spherical ( s -C 3 N 4 ) modifications of carbon nitride were measured as a function of green pulsed (6 ns-pulse) laser intensity. It was found that the intensity of the laser increases the maximum of the fluorescence shifts towards the anti-Stokes side of the fluorescence for s -C 3 N 4 spherical nanoparticles. This phenomenon was not observed for g -C 3 N 4 particles. The maximum of the anti-Stokes fluorescence in s -C 3 N 4 nanoparticles was observed at 480 nm. The ratio of the intensity of the anti-Stokes peak (centered at 480 nm) to that of the Stokes peak (centered at 582 nm) was measured to be I 484/582 = 6.4 × 10 -3 at a low level of intensity (5 mW) of a green pulsed laser, whereas it rose to I 484/582 = 2.27 with a high level of laser intensity (1500 mW).

Enhancement of the Anti-Stokes Fluorescence of Hollow Spherical Carbon Nitride Nanostructures by High Intensity Green Laser