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J Am Chem Soc. 2005 Jun 29;127(25):8968-70.

Light-controlled molecular switches modulate nanocrystal fluorescence.

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1
Department of Chemistry and Center for Materials Research, Washington State University, Pullman, Washington 99164.

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.

PMID:
15969571
PMCID:
PMC1435833
DOI:
10.1021/ja0423421
[Indexed for MEDLINE]
Free PMC Article
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