Figure 3From: White Electroluminescence Using ZnO Nanotubes/GaN Heterostructure Light-Emitting Diodea Room temperature EL spectra of ZnO/GaN LEDs under forward bias from nanotubes (blue) and nanorods (red). Digital images of the LED devices taken at the same applied voltage from b ZnO nanotubes c ZnO nanorodsBack to article page