AlGaInP-based Red Nano-rod LEDs with Ag Nanowire / Graphene Transparent Conductive Layers

Abstract

A light source for the three primary colors of light, R, G, B is essential for composing a display panel, and in the case of a nano-rod array device that can fabricate a flexible device without a transfer method, it is necessary to analyze each of R, G, B. In this study, we tried to use a hybrid electrode complementary to each other by combining graphene and AgNW to fabricate a red nano-rod LED. Graphene was used to increase the contact area of the p-electrode as well as to secure conductivity, and AgNW was added to compensate for the high sheet resistance of graphene. Therefore, red nano-rod LEDs with three types of electrode structures were fabricated: AgNW/ AgNW on graphene monolayer/ AgNW on graphene trilayer. It was confirmed through Raman analysis that the graphene damage caused by the PDMS and rod structures was reduced in Type 3: AgNW on graphene trilayer. With the addition of the graphene layer, the transmittance decreased, confirming that Type 3: AgNW on graphene trilayer had the lowest transmittance. However, by adding a graphene layer, the sheet resistance was reduced, and it was confirmed that the sheet resistance was reduced by using an AgNW on the graphene trilayer hybrid electrode rather than using a single transparent electrode. Through the nano-rod array analysis with three transparent electrode structures, it was confirmed that the type 3 LED had the best efficiency in the EL analysis.