Absorption Spectra of Exciplexes

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Abstract
Absorption spectra of the exciplexes of pyrene, anthracene, biphenyl, and naphthalene with diethylaniline (DEA) as a common electron donor are recorded by applying pulse laser photolysis. The numerous bands appearing in the spectra are analyzed and attributed to transitions from the emitting charge‐transfer state, (A − D +), to higher excited charge‐transfer states [(A −* D +) and (A − D +*)], as well as to locally excited states [(A * D) and (AD *)]. The results indicate that exciplex absorption spectroscopy may provide a new route to the experimental observation of excited molecular states (of D or A), which are not detectable in the ground statespectra of the corresponding molecules.