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Getting turned on: A photoelectrochemical reaction has been used to control the photoluminescence of self-assembled nanosheet films intercalated with Ln3+ ions. Emission (em) occurs under anodic bias (mechanism shown) and not under cathodic bias because of the oxidation and reduction of Ln3+/Lnn+ by holes and electrons by UV light, respectively (see picture, VB=valence band, CB=conduction band), which allows control of the emission on/off response.
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Ida et al. (2008) studied this question.
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