Figure 5.

EL spectrum of n-ZnO/p-GaN and n-ZnO/NiO/p-GaN. (a) ZnO nanorods and (b) ZnO nanotubes. Insets show digital photographs of ZnO nanorod- and nanotube-based LEDs with NiO buffer layer.

Abbasi et al. Nanoscale Research Letters 2013 8:320   doi:10.1186/1556-276X-8-320
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