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A SEM image of a ZnO microparticle.
(a) A PL spectrum collected from a large number of ZnO microparticles excited by UV light of a He–Cd laser (wavelength: ) at . (b) A CL spectrum collected from the whole of the ZnO microparticle (Fig. 1) excited by electron beam (accelerating voltage: , beam current: ) at .
Spatially resolved CL spectra at three different spots in the ZnO microparticle, indicated by the crosses (a)–(c) in Fig. 1, measured at .
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