Efficiency enhancement of nanorod green light emitting diodes employing silver nanowire-decorated graphene electrode as current spreading layer

Abstract

We report nanorod green light emitting diodes (NGR-LEDs) with a silver nanowire-decorated graphene electrode (S-DGE) as a current spreading electrode to connect each individual nanorod and to give improved emission efficiency. The current-voltage and electroluminescence characteristics of NGR-LEDs with an S-DGE are enhanced remarkably compared to NGR-LEDs with a graphene electrode. The effective current spreading in the whole emission area after thermal annealing of the S-DGE was attributed to reduced sheet and contact resistances caused by the p-type doping of graphene and enhanced adhesion at the graphene-GaN and graphene-silver nanowire interfaces.