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A photo controlled and reversible fluorescent switching system was constructed with fluorescence ZnO quantum dots (ZnO-QDs) and a photochromic diarylethene. Upon alternate irradiation with UV and visible lights, the fluorescence emission of the ZnO-QDs could be modulated between ''ON'' and ''OFF'' repeatedly. The results indicated that the strategy of constructing ZnO-QDs/diarylethene based switching system was feasibility. Moreover, a logic circuit was designed with the fluorescence intensity at 568 nm as output and the diarylethene and UV/vis lights as inputs.

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