Synthesis of white fluorescent pyrrolic nitrogen-doped graphene quantum dots

Generation of bright white-light emitting diode is essential for electronic indicator and low-power lighting applications. Therefore, synthesis of white light emitting material with high quantum efficiency is highly desired. Herein, we report a facile approach to synthesize white light emitting material, i.e. pyrrolic nitrogen doped graphene quantum dots (pN-GQDs) via a solvothermal method. It was found that the pN-GQDs photoluminescence properties, i.e. emission wavelength, intensity and spectrum width, depend on the concentration of pyrolic nitrogen. In typical process, the pN-GQDs sample can emit white light, spectrum width as high as 350 nm, with brightness increase with the increasing of pyrrolic nitrogen. This characteristic is promising for white light emitting diode fabrication, hence lighting application. The synthetic approach of pN-GQDs preparation and characterization will be discussed.