光致发光
化学
共轭体系
光化学
金属
光电子学
聚合物
有机化学
物理
作者
Mingrui Yang,Pavel Moroz,Zhicheng Jin,Darya S. Budkina,Nida Sundrani,Dmitry Porotnikov,James Cassidy,Yasumasa Sugiyama,Alexander N. Tarnovsky,Hedi Mattoussi,Mikhail Zamkov
摘要
Assemblies of metal nanostructures and fluorescent molecules represent a promising platform for the development of biosensing and near-field imaging applications. Typically, the interaction of molecular fluorophores with surface plasmons in metals results in either quenching or enhancement of the dye excitation energy. Here, we demonstrate that fluorescent molecules can also engage in a reversible energy transfer (ET) with proximal metal surfaces, during which quenching of the dye emission via the energy transfer to localized surface plasmons can trigger delayed ET from metal back to the fluorescent molecule. The resulting two-step process leads to the sustained delayed photoluminescence (PL) in metal-conjugated fluorophores, as was demonstrated here through the observation of increased PL lifetime in assemblies of Au nanoparticles and organic dyes (Alexa 488, Cy3.5, and Cy5). The observed enhancement of the PL lifetime in metal-conjugated fluorophores was corroborated by theoretical calculations based on the reverse ET model, suggesting that these processes could be ubiquitous in many other dye-metal assemblies.
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