Metal-enhanced fluorescence (MEF) and delayed fluorescence (alpha α-S 1 ) studies of acriflavin have been undertaken using steady-state and time-resolved fluorescence measurements on silver island films (SiFs) supporting a thin poly(vinyl alcohol) (PVA) polymer film. Nearly a 3.5-fold enhancement in the far-field fluorescence intensity of acriflavin is observed coupled with a decrease in decay times and an improved fluorophore photostability. Our findings are consistent with our proposed model of the coupling and transferring of the excited state energies of fluorophores to silver surface plasmons. Further, an excitation power dependence of MEF is observed in these films, consistent with our postulate of MEF EVE (MEF excitation volumetric effect) and, ultimately, resulting in a ∼7-fold enhancement in fluorescence intensity. Our findings suggest a significant opportunity for the development of shorter-lived, brighter, high photon flux luminescent materials for multifarious applications in the life-sciences.
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Mishra et al. (2014) studied this question.
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