The optical properties of electrodeposited Zn-ZnO structures annealed at different temperature in oxygen ambient are studied. Zn and ZnO coexist in all samples measured by x-ray diffraction, but only ZnO is observed for a sample annealed at 800 °C. From photoluminescence analyses, green and orange-red emissions are observed from an as-prepared sample. The spectrum is almost the same for the sample annealed at 300 °C. It shows a strong ultraviolet (UV) emission at the wavelength of 374 nm for the annealing temperature of 500 °C; the UV emission redshifts to 384 nm for the annealing temperature of 800 °C. The existence of metallic Zn crystals in ZnO plays a significant role in the emission characteristics.
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Lee et al. (2007) studied this question.
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