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The lifetimes of the monomer and the excimer of a pyrene phospholipid in Langmuir−Blodgett films with a counterlayer containing an electron acceptor are independent of the surface density of the acceptor. Only when the acceptor is located within a disk of a critical radius underneath the donor does a photoinduced electron transfer appear. The amount of free-emitting species is then reduced.
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Huesmann et al. (1997) studied this question.
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