Enhancement of light output power in ultraviolet light emitting diodes using graphene film on self-assembled Au nanocluster by agglomeration process

Abstract

We applied graphene network on Au nanoclusters as a transparent and current spreading electrode in GaN-based ultraviolet (UV) light emitting diode (LED). The electroluminescence (EL) of UV-LEDs with graphene film on Au nanoclusters was enhanced by 10% at injection current of 20 mA, while keeping reasonably good injected current-voltage (I-V) characteristics. This result is attributed to the reduction of absorption at UV wavelength region, effective current spreading and injection by reduced sheet and contact resistance, and texturing effect through Au nanocluster. (C) 2013 AIP Publishing LLC.