Figure 4From: Electroluminescence of ordered ZnO nanorod array/p-GaN light-emitting diodes with graphene current spreading layerPL spectra of the ZnO nanorod arrays and EL spectra of the corresponding LEDs. (a) PL spectra of the ZnO nanorod arrays on the p-GaN substrate with different diameters. (b) EL spectra of the LEDs based on ZnO nanorod arrays with different diameters at the injection current of 6 mA.Back to article page