Electroluminescence in n-ZnO nanorod arrays vertically grown on p-GaN

Electrolurninescent (EL) devices (see Figure) have been fabricated using n-ZnO nanorod arrays grown on p-GaN epilayers. Simple heteroepitaxial growth yields vertically aligned ZnO nanorods with an abrupt interface on GaN. The p-n heterojunction EL device shows a high current density and strong electroluminescence even at a reverse-bias voltage of 3 V.