Fluorescence spectra of graphitic (-CN) and spherical (-CN) 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 -CN spherical nanoparticles. This phenomenon was not observed for -CN particles. The maximum of the anti-Stokes fluorescence in -CN 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 = 6.4 × 10 at a low level of intensity (5 mW) of a green pulsed laser, whereas it rose to I = 2.27 with a high level of laser intensity (1500 mW).
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| http://dx.doi.org/10.3390/nano11102529 | DOI Listing |
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