Ultrafast photogeneration mechanisms of triplet states in para-hexaphenyl

dc.contributorVirginia Techen
dc.contributor.authorZenz, C.en
dc.contributor.authorCerullo, G.en
dc.contributor.authorLanzani, G.en
dc.contributor.authorGraupner, W.en
dc.contributor.authorMeghdadi, F.en
dc.contributor.authorLeising, G.en
dc.contributor.authorDe Silvestri, S.en
dc.contributor.departmentPhysicsen
dc.date.accessed2014-04-23en
dc.date.accessioned2014-05-07T15:37:09Zen
dc.date.available2014-05-07T15:37:09Zen
dc.date.issued1999-06en
dc.description.abstractWe present femtosecond pump-probe measurements, both conventional and electric field-assisted, on organic light-emitting devices based on para-hexaphenyl. The dominant triplet excition generation mechanism is assigned to nongeminate bimolecular recombination of photogenerated, spin-1/2 polarons. This process is active within a few hundred femtoseconds after photoexcitation and involves about 20% of the initially excited states. At higher photoexcitation densities, we observe an additional triplet generation mechanism, which occurs in the 10-ps time domain, due to fusion of singlet excitons and subsequent fission into correlated triplet pairs. The latter decay on the 10(2)-ps time scale by geminate recombination.en
dc.description.sponsorshipEC Contract No. FMRX-CT97-0106en
dc.description.sponsorshipSFB Elektroaktive Stoffeen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationZenz, C.; Cerullo, G.; Lanzani, G.; Graupner, W.; Meghdadi, F.; Leising, G.; De Silvestri, S., "Ultrafast photogeneration mechanisms of triplet states in para-hexaphenyl," Phys. Rev. B 59, 14336 DOI: http://dx.doi.org/10.1103/PhysRevB.59.14336en
dc.identifier.doihttps://doi.org/10.1103/PhysRevB.59.14336en
dc.identifier.issn0163-1829en
dc.identifier.urihttp://hdl.handle.net/10919/47905en
dc.identifier.urlhttp://journals.aps.org/prb/abstract/10.1103/PhysRevB.59.14336en
dc.language.isoenen
dc.publisherAmerican Physical Societyen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectfield-induced dissociationen
dc.subjectconjugated polymersen
dc.subjectpoly(p-phenylene)en
dc.subjectoligomersen
dc.subjectdynamicsen
dc.subjectelectroluminescenceen
dc.subjectfilmsen
dc.subjectpoly(para-phenylene)en
dc.subjectphotoexcitationsen
dc.subjecttransitionsen
dc.subjectgenerationen
dc.subjectphysics, condensed matteren
dc.titleUltrafast photogeneration mechanisms of triplet states in para-hexaphenylen
dc.title.serialPhysical Review Ben
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten

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