Light-Controlled Molecular Switches Modulate Nanocrystal Fluorescence
Journal of the American Chemical Society2005Vol. 127(25), pp. 8968–8970
Citations Over TimeTop 10% of 2005 papers
Abstract
Spiropyran dyes were attached to fluorescent core-shell CdSe/ZnS nanocrystals via thiol-containing linkers. Photoisomerization of the dye to its merocyanine form by UV irradiation caused a dramatic loss in the intrinsic nanoparticle fluorescence, which was regained upon reversing the isomerization with visible light. The fluorescence quenching efficiency increased with increasing spectral overlap of fluorescence emission and merocyanine adsorption bands, consistent with FRET as the quenching mechanism. Typically, complete quenching required at least 80 bound dye molecules per particle.
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