Ultrafast photogeneration mechanisms of triplet states in para-hexaphenyl
dc.contributor | Virginia Tech | en |
dc.contributor.author | Zenz, C. | en |
dc.contributor.author | Cerullo, G. | en |
dc.contributor.author | Lanzani, G. | en |
dc.contributor.author | Graupner, W. | en |
dc.contributor.author | Meghdadi, F. | en |
dc.contributor.author | Leising, G. | en |
dc.contributor.author | De Silvestri, S. | en |
dc.contributor.department | Physics | en |
dc.date.accessed | 2014-04-23 | en |
dc.date.accessioned | 2014-05-07T15:37:09Z | en |
dc.date.available | 2014-05-07T15:37:09Z | en |
dc.date.issued | 1999-06 | en |
dc.description.abstract | We 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.sponsorship | EC Contract No. FMRX-CT97-0106 | en |
dc.description.sponsorship | SFB Elektroaktive Stoffe | en |
dc.format.mimetype | application/pdf | en |
dc.identifier.citation | Zenz, 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.59.14336 | en |
dc.identifier.doi | https://doi.org/10.1103/PhysRevB.59.14336 | en |
dc.identifier.issn | 0163-1829 | en |
dc.identifier.uri | http://hdl.handle.net/10919/47905 | en |
dc.identifier.url | http://journals.aps.org/prb/abstract/10.1103/PhysRevB.59.14336 | en |
dc.language.iso | en | en |
dc.publisher | American Physical Society | en |
dc.rights | In Copyright | en |
dc.rights.uri | http://rightsstatements.org/vocab/InC/1.0/ | en |
dc.subject | field-induced dissociation | en |
dc.subject | conjugated polymers | en |
dc.subject | poly(p-phenylene) | en |
dc.subject | oligomers | en |
dc.subject | dynamics | en |
dc.subject | electroluminescence | en |
dc.subject | films | en |
dc.subject | poly(para-phenylene) | en |
dc.subject | photoexcitations | en |
dc.subject | transitions | en |
dc.subject | generation | en |
dc.subject | physics, condensed matter | en |
dc.title | Ultrafast photogeneration mechanisms of triplet states in para-hexaphenyl | en |
dc.title.serial | Physical Review B | en |
dc.type | Article - Refereed | en |
dc.type.dcmitype | Text | en |
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