Light-controlled molecular switches modulate nanocrystal fluorescence.
Light-controlled molecular switches modulate nanocrystal fluorescence.
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DOI：
10.1021/ja0423421
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发表时间：
2005-06
影响因子：
15
通讯作者：
Linyong Zhu;Mingqiang Zhu;J. K. Hurst;Alexander D. Q. Li
中科院分区：
文献类型：
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作者：
Linyong Zhu;Mingqiang Zhu;J. K. Hurst;Alexander D. Q. Li
螺吡喃染料通过硫醇连接物连接到荧光核壳结构的硫化镉/硫化锌纳米晶上。紫外光照射使染料光异构化为花菁形式，导致纳米颗粒本征荧光的显著损失，而在可见光下逆转异构化后，该荧光又被恢复。荧光猝灭效率随着荧光发射光谱和花菁吸收带重叠程度的增加而增加，与FRET猝灭机理一致。通常，完全猝灭需要每个颗粒至少80个结合的染料分子。
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.