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(Color online) Photoluminescence (PL) intensity vs emission wavelength for ensembles of ZnO nanorods as grown (blue solid line) and after the rods have been annealed in forming gas for at (magenta dashed line). The inset shows the PL spectra for stoichiometric ZnO powder (Fisher, red dotted line) and ZnO:Zn powder (GTE, black dashed line). The excitation source was the tripled Nd:YLF pulsed laser at .
(Color online) Persistence of deep emission intensity for as-grown ZnO nanorods (blue solid line), compared with stoichiometric (Fisher, red dotted line) and ZnO:Zn powders (GTE, black dashed line). The PL intensity was monitored at 620 and for the ZnO nanorods and powders, respectively. The inset depicts the insensitivity of PL persistence with respect to annealing for nanorods (magenta dashed line and green dotted line).
(Color online) SEM (left) and CL (right) images of (a) individual and (b) a cluster of ZnO nanorods. (c) CL (orange) and PL (black) spectra of an ensemble of as-grown ZnO nanorods. CL was taken at and beam current. PL excitation source was a continuous wave Ar laser at .
(Color online) Integrated PL intensity vs excitation wavelength. The orange circles represent visible band , and the blue squares represent near-band-gap UV emission . The UV emission intensity was multiplied by 10. The UV emission cannot be measured past due to the interference from the excitation light. Inset: the PL spectra for excitation wavelengths of 320 (red dashed line), 355 (blue solid line), and (black dotted line). The excitation source was a Xe lamp and the results were normalized to lamp power at each wavelength.
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