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Optical detection of the lowest triplet excited state of oligothiophenes and anthryloligothiophenes

✍ Scribed by P. Landwehr; H. Port; H.C. Wolf

Publisher: Elsevier Science
Year: 1996
Tongue: English
Weight: 344 KB
Volume: 260
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(96)00893-7

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✦ Synopsis

The lowest excited triplet state of all-trans oligothiophenes T, (n = 2... 5), 9-anthryl-oligothiophenes A-T~ (n = 1 ... 3) and 9-anthryl-bithienylpyridine A-T2-Py in the crystalline phase has been investigated by delayed fluorescence detected high resolution photoexcitation spectroscopy. For the T~ molecules a 1/n dependence of the triplet energies is observed. On the other hand, the triplet states of the anthracene substituted compounds A-T, and A-T2-Py do not differ much in energy. Their spectra reflect predominant anthracene character, independent of the chain length.

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