Spectroscopy and transport of the triplet exciton in a terthiophene end-capped poly(phenylene ethynylene)

Alison Funston, Eric Silverman, K Schanze, John Miller

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Abstract

Triplet states of poly(phenylene ethynylene), (PPE)-P-3*, not easily formed by direct photoexcitation, were produced by pulse radiolysis in toluene, along with triplet states of T3PPE having terthiophene end-caps. Intense triplet-triplet absorption maxima, (is an element of 680)((PPE)-P-3*) 9.5 x 10(4) M-1 cm(-1) and (is an element of 780)((T3PPE)-T-3*)) 2.8 x 10(4) M-1 cm(-1) enable identification of these two species, which have triplet energies of 2.12 and 1.77 eV determined in bimolecular energy transfer equilibria. Bleaching of ground-state absorption measures (PPE)-P-3* to be the delocalized over a 1.8-nm length. Triplet states formed in the PPE chains were transported to and trapped by the end caps in a time
Original languageEnglish
Pages (from-to)17736 - 17742
Number of pages7
JournalJournal of Physical Chemistry B
Volume110
Issue number36
Publication statusPublished - 2006
Externally publishedYes

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