Phys. Rev. B 71, 155207 (2005) [7 pages]Two-step field-induced singlet dissociation in a fluorene trimer
J. Cabanillas-Gonzalez *, M. R. Antognazza, T. Virgili, and G. Lanzani
C. Gadermaier
M. Sonntag and P. Strohriegl Received 9 September 2004; revised 13 December 2004; published 26 April 2005 We time resolve the event of singlet separation into free carriers in an oligofluorene using femtosecond field assisted pump-probe technique. Steady state photoinduced absorption (PA) measurements have also been employed to identify triplet absorption (T1−Tn) in the spectral region of 1.8 eV . As a result of an applied electric field of 2.2 MV∕cm singlets are observed to undergo a dissociation process consisting of first singlet splitting into bound polaron pairs and second further dissociation of polaron pairs into free carriers. Subsequent free carrier recombination yields a new population of singlets and triplets. Our results suggest that nongeminate recombination leads to the formation of 35% singlets and 65% triplets. ©2005 The American Physical Society
URL: http://link.aps.org/doi/10.1103/PhysRevB.71.155207 * Electronic address: juan.cabanillas@polimi.it; telephone: +39022399 6055; Fax: +39022399 6126. [ Abstract | Previous article | Next article | Issue 15 ] |
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