Graphene is a zero-bandgap semiconductor, no optical luminescence is observed in pristine graphene.A bandgap, however, can be engineered into graphene quantum dots (GQDs) due to quantum confinement and edge effects.Doping carbon materials with heteroatoms can effectively tune their intrinsic properties, thus producing new phenomena and unexpected characteristics.Although various heteroatom-doped carbon materials have been reported, doped GQDs have been much less studied.