Abstract
The emission spectra of polyacenaphthylene (PAcN) and polyvinylnaphthalene (PVN) films and solutions have been compared at room temperature and 77°K. In organic glasses at 77°K, normal fluorescence and phosphorescence are observed for both polymers. Quenching of PAcN phosphorescence by piperylene in a glass obeys a Stem-Volmer type equation; the slope of the straight line is identical to that reported for PVN in the same conditions. In solution at room temperature, the ratio of excimer to normal fluorescence yields is 1 · 3 for PAcN whereas it is 12 · 6 for PVN. No luminescence other than excimer fluorescence is emitted by polymer films at room temperature and 77°K. The intensity of that emission decreases in the presence of benzophenone because of singlet energy transfer to the additive. The efficiency of the transfer is identical for PAcN and PVN (Förster's R o = 15 A ̊ ). The results are discussed according to a general kinetic treatment and in terms of the mobility of the chromophore side groups.
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