Graphene-based composite emitter

Abstract

Because of its zero bandgap, graphene has not been considered to be useful for optoelectronic devices that utilize absorption or photoemission phenomena. Even though the finite size 0D graphene quantum dots can open the bandgap due to quantum confinement, graphene composites through hybridization have been investigated to control optical properties. Photoluminescence (PL) quenching or enhancement was achieved by resonance energy transfer to graphene or by the localized surface plasmon of graphene. Reduced graphene oxide (rGO) and graphene oxide (GO) composites with metal oxide (MO) also reduced or increased the PL intensity of the band-edge emission, or visible light emission related to the defect in MO was ascribed to charge transfer from MO to rGO or GO and depended on the amounts of sp² C–C bonding in rGO and GO. These graphene-based functional composites have been also extensively developed as an active light-emitting material and a very promising candidate for flexible lighting and light-emitting diode.