Nanoscale ZnO Window Layer Textured 650nm Resonant Cavity Light Emitting Diode

Abstract

We propose a simple technique to improve the light extraction efficiency of 650nm AlGaInP/GaInP resonant cavity light emitting diodes (RCLEDs) by using nanoscale textured-ZnO window layer. This layer was performed using a hydrothermal synthesis method, and the treatment solution for ZnO texturing growth on the RCLED surface was investigated. In addition, it has also been found that the optimum roughness of the nanoscale ZnO texturing for enhancing the light efficiency is about 300nm. As compared with the conventional RCLED, the nanoscale ZnO-textured RCLED, which has the optimum average roughness of 300nm, performs higher external quantum efficiency, a higher light output power, and a narrower spectrum width.