The effects of annealing treatment on the photoluminescence (PL) characteristics of ZnO microtibes, which have been synthesized by introducing ammonia water into zinc chloride aqueous solution, were investigated using a spectrofluorometer. X-ray photoelectron spectroscopy (XPS) is useful for investigating the bonding state of zinc and oxygen by analyzing the energy of photoelectrons. The results in this investigation revealed that the luminescence mechanism was associated primarily with oxygen vacancies. The PL results demonstrated that the central intensity of light emission shifted from orange (582 nm) to red (612 nm). XPS results showed that the concentration of oxygen vacancies decreased after the annealing treatment at 600 °C for 2 h under an ambient atmosphere.
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