Localized Surface Plasmon Coupling Nanorods With Graphene as a Transparent Conductive Electrode for Micro Light-Emitting Diodes

A localized surface plasmon (LSP) coupling nanorod $\mu $ LED using graphene as a transparent conductive electrode structure was demonstrated. The optical performance of the $\mu $ LED with LSP coupling is enhanced by about 36% in external quantum efficiency and 84% in photoluminescence measurements as compared with the LSP-free sample. This LSP coupling enhancement relies on the very large sidewall area provided by the nanorod structure and the zero distance contact between the nanoparticles and nanorods. This work provides a broad prospect for the application of LSP in the $\mu $ LED field.