Figure 4
Schematic representation of the proposed growth process. (a,b) Graphene quantum dots (GQDs) are interconnected through binding with metal atoms, (c) stacking of interconnected graphene solid sheet layers and indirect FRET excitation by the GQDs emission, (d) quantum well design of the sheet sample, representing the non radiative relaxation of photoexcited electrons, when excited directly. This is due to the delocalization of photoexcited e-h pairs. (e) In the solid sheet - GQDs coupled structure, the photoexcited electrons present in all the excited states because of the simultaneous excitation of all the domains by FRET process and therefore the delocalization process is suppressed, (f) Photographic image of Z7 sample when illuminated with UV light. The CIE chromaticity diagram representing the emission from Z7 sample is given in the Supplementary Fig. S8.
