The investigation explores the fabrication and characteristics of ZnO nanowire (NW)/p-GaN/ZnO NW heterojunction light-emitting diodes (LEDs). Vertically aligned ZnO NWs arrays were grown on the p-GaN substrate. The n-p-n heterojunction LED was fabricated by combining indium tin oxide/glass substrate with the prepared ZnO NWs/p-GaN substrate. The symmetrical rectifying behavior demonstrates that the heterostructure herein was formed with two p-n junction diodes and connected back to back. The room-temperature electroluminescent emission peak at 415 nm was attributed to the band offset at the interface between n-ZnO and p-GaN and defect-related emission from ZnO and GaN. Finally, the photograph indicated the LED clearly emitted blue light.

This study evaluated a process for fabricating white light emitting diodes (LEDs) by doping Ga into ZnO nanowires (ZnO:Ga NWs) on p-GaN substrates. Vertically aligned ZnO:Ga NWs were grown by thermal chemical vapor deposition to 0.7 μm in length and 50−300 nm in diameter. The white light LED was successfully fabricated by forming an n-p-n heterojunction on an ITO/glass substrate. The electroluminescence (EL) emission peak was 500 nm, and the broad band fwhm intensity was 200 nm. Finally, photographs show a white light from the ZnO:Ga LED.

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