Tuning the Photoluminescence of Graphene Quantum Dots by Fluorination

Figure 3

(a) The UV-vis absorption spectra of the GQDs and F-GQDs dispersed in water, and the insets are the optical photographs of the corresponding samples under the excitation with the wavelength of 360 nm. (b) The PL spectra of F-GQDs under excitation with different wavelengths. (c) The comparison of PL spectra of GQDs with F-GQDs under the irradiation with the wavelength of 324 nm. (d) The PLE spectrum of F-GQDs when fixing the emission wavelength at 450 nm. (e) The typical electronic transitions of triple carbenes in the optical spectrum of the F-GQDs. (f) The schematic illustration of the typical electronic transitions processes of F-GQDs.

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