Highly Effi cient Light-Emitting Diode of Graphene Quantum Dots Fabricated fr…

With strong optical absorptivity and a widely tunable bandgap,graphene is an attractive material for optical and optoelectronic devices. [ 1,2 ] Recently, emerging graphene quantum dots (GQDs), single- or few-layer graphene only several nanometers in size, have been implemented in bandgap engineering due to quantum confi nement [ 3,4 ] and edge effects, [ 5 ] which potentially can be exploited …