Excimers in light-emitting conjugated polymers
نویسنده
چکیده
The electronic structures of the low-lying excited states for two parallel chains of poly (p-phenylene-vinylene! with arbitrary relative positions are studied. The interchain interaction is treated microscopically. The energy and charge transfer fraction of the ~light-emitting! lowest singlet state are found to depend sensitively on the horizontal shift of the two chains, which is in turn determined by the packing geometry. Our predictions of the excimer-forming geometry and the relative ~dipole-forbidden! photoluminescence lifetimes are in excellent agreement with experiments. @S0163-1829~98!07529-8#
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