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Energy transfer in polymers—V. Singlet and triplet energy transfer in polyacenaphthylene

✍ Scribed by C. David; M. Lempereur; G. Geuskens

Publisher
Elsevier Science
Year
1972
Tongue
English
Weight
528 KB
Volume
8
Category
Article
ISSN
0014-3057

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✦ Synopsis

The emission spectra of polyaeenaphthylene (PA&T) and polyvinyluaphthalene (PVN) tihus and solutions have heen compared at room temperature and 77°K. In organic glasses at 77'K, normal fluoresceuee and phosphorescence are observed for both polymers. Quenching of PAcN phosphorescence by piperylene in a glass obeys a Stem-Vohuer type equation; the slope of the straight line is identical to that reported for PVN in the same conditions. Iu 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 thau 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 (F6rster's RO = 15 A). The results are discussed according to a general kinetic treatment and iu terms of the mobility of the chromophore side groups.

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