Metal-Enhanced S2 Fluorescence from Azulene

In this paper, we report the first observation of metal-enhanced S2 emission at room and low temperature (77K). The S2 emission intensity of Azulene is enhanced by close proximity to Silver island films (SiFs). In this regard, a ≈ 2-fold higher S2 fluorescence intensity of Azulene was observed from SiFs as compared to a glass control sample. This suggests that S2 excited states can couple to surface plasmons and enhance S2 fluorescence yields, a helpful observation in our understanding the interactions between plasmons and lumophores, and our continued efforts to develop a unified plasmon-lumophore/fluorophore theory.

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