Figure 3From: The fabrication of white light-emitting diodes using the n-ZnO/NiO/p-GaN heterojunction with enhanced luminescenceCL spectra of nanorods and nanotubes without and with NiO buffer layer. ZnO nanorods (a) on GaN and (b) on NiO thin-layer-coated GaN. ZnO nanotubes (c) on GaN and (d) on NiO thin-layer-coated on GaN.Back to article page