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(a) SEM image of ZnO tetrapod; (b) the cathodoluminescence image of the zinc oxide tetrapod.
The room temperature emission spectra of ZnO tetrapod: (a) photoluminescence, excited by ultraviolet light and (b) cathodoluminescence.
The transient behaviors of a single ZnO tetrapod: (a) low-density excitation (full scale is ); (b) high-density excitation (full scale is ).
The relationship between emission peak intensity and pump density.
Super-radiance spectra from a single ZnO tetrapod nanostructure (at the peak pump density of ).
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