Room Temperature Blue-UV Electroluminescence from ZnO Light-Emitting Diodes Involving Na-Doped p-Type ZnO and ZnO/ZnMgO Multi-Quantum Wells

Using ZnO/Zn0.9Mg0.1O multi-quantum wells as active layer and Na as acceptor dopant of ZnO, we fabricate ZnO light-emitting diode (LED) on silicon substrate. We observe strong blue-violet emission and negligible defect emission from this device under low current injection at room temperature. This work could have significant impact on the practical application of ZnO LED.