Abstract
The photoenhancement effect of the band-edge photoluminescence in ZnO nanocrystals dispersed in ethanol is investigated by observing changes in optical properties after ultraviolet illumination. Time-resolved measurements at 20 K reveal that the band-edge luminescence is composed of two components and the enhancement occurs in the low-energy one, while the intensity for the high-energy component is significantly decreased by the illumination. The origin of the changes is ascribed to the modified electronic structures caused by the negative charging of the oxygen vacancy, and also to the filling of the conduction band by the excess electrons.
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