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The photoluminescence (PL) behavior of γ-Al2O3 nanopowder is studied. Two emission peaks at 343 and 378nm and a broadband ranging between 400 and 600nm are observed. The peaks are attributed to F+ center, while the broadband is attributed to impurities. It is found that irradiating the sample with intense ultraviolet (UV) light can cause significant decrease in the intensity of the two peaks, but has no effect on the broadband. A simple model is proposed to explain the kinetics of UV irradiation-induced PL degradation.
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Liu et al. (2006) studied this question.
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