| Abstract
| - The impact of exciton−phonon (EP) coupling including two or more vibrational modes on emission inherringbone aggregates with N molecules is investigated theoretically. When the total nuclear relaxation dueto all modes is much smaller than the exciton band curvature at the band minimum, the effects of severalmodes are additive, with each mode contributing a single sideband to the emission spectrum in the limit oflarge N. Outside the weak coupling regime synergistic intermode effects arise. In particular, the presence ofa strongly coupled mode enhances the sideband intensity of a weakly coupled mode. Applications are madeto photoluminescence spectra of oligothiophene thin films.
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