Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

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Record number 447722
Title Emission enhancement and lifetime modification of phosphorescence on silver nanoparticle aggregates
Author(s) Gill, R.; Tian, L.; Amerongen, H. van; Subramaniam, V.
Source Physical Chemistry Chemical Physics 15 (2013). - ISSN 1463-9076 - p. 15734 - 15739.
DOI https://doi.org/10.1039/c3cp50407g
Department(s) Biophysics
Publication type Refereed Article in a scientific journal
Publication year 2013
Keyword(s) single-molecule fluorescence - oxygen generation - luminescence - spectroscopy - photochemistry - complexes - yields
Abstract Silver nanoparticle aggregates have been shown to support very large enhancements of fluorescence intensity from organic dye molecules coupled with an extreme reduction in observed fluorescence lifetimes. Here we show that for the same type of aggregates, similar enhancement factors (similar to 75 x in intensity and similar to 3400 x in lifetime compared to the native radiative lifetime) are observed for a ruthenium-based phosphorescent dye (when taking into account the effect of charge and the excitation/emission wavelengths). Additionally, the inherently long native phosphorescence lifetimes practically enable more detailed analyses of the distribution of lifetimes (compared with the case with fluorescence decays). It was thus possible to unambiguously observe the deviation from mono-exponential decay which we attribute to emission from a distribution of fluorophores with different lifetimes, as we could expect from a random aggregation process. We believe that combining phosphorescent dyes with plasmonic structures, even down to the single dye level, will offer a convenient approach to better characterize plasmonic systems in detail.
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