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Light switches: UV irradiation induces Rhodamine B (RhB) aggregation into nanoparticles and changes RhB photoluminescent emissions from yellow to white light (see graphic). The UV-induced changes are reversible. A novel approach to generate organic fluorescent nanoparticles and to prepare white-light-emitting fluorescent materials is demonstrated.
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Hsu et al. (2011) studied this question.
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