Figure 2From: The correlation between radiative surface defect states and high color rendering index from ZnO nanotubes CL spectra of ZnO nanorods and nanotubes. (a) Room temperature CL spectra of ZnO nanorods (black) and nanotubes (red). (b, d) SEM images of the rods and tubes with their corresponding monochromatic CL images (c, e).Back to article page