Abstract
The intramolecular exciplex formed from N,N-methylphenyl 2-ethyl-(2-naphthoyl)amine was studied by time-resolved emission spectroscopy using a cavity-dumped argon ion laser (wavelength, λ = 257.25 nm) and single-photon counting detection. The spectra, taken at several time delays after excitation, show that the excited amine (lifetime, τ f = 1.78 ns) contributes to the exciplex formation. The excited naphthoate (τ f = 7.98 ns) is the major species observed in the late-gated spectrum (31 ns after excitation), its lifetime being larger than that of the exciplex (τ f = 4.27 ns). The results obtained are explained on the basis of the existence of a static quenching and a slow dynamic quenching.
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