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(Color online) (a) Schematic illustration of a coaxial nanorod heterostructure on . (b) FEG-SEM image of ZnO nanoneedle arrays grown on . ZnO nanoneedles are well aligned perpendicular to the surface. (c) SEM image of coaxial nanorod heterostructure. (d) HR-TEM image of coaxial nanorod heterostructures.
(Color online) (a) Photograph of light emission from the EL device at a bias voltage of . The electroluminescence was strong enough to be clearly observed with naked eyes. (b) Room temperature EL spectra of the nanorod LED based on coaxial nanorods grown on .
(Color online) (a) Room temperature EL spectra of a coaxial nanorod array on heterojunction device at various applied current levels. (b) Temperature-dependent PL spectra of coaxial nanorods.
Integrated emission intensity of the EL spectrum and current as a function of the applied bias voltage.
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