Title:
On the polarization of the green emission of polyfluorenes
On the polarization of the green emission of polyfluorenes
dc.contributor.author | Yang, X. H. | en_US |
dc.contributor.author | Neher, D. | en_US |
dc.contributor.author | Spitz, C. | en_US |
dc.contributor.author | Zojer, Egbert | en_US |
dc.contributor.author | Brédas, Jean-Luc | en_US |
dc.contributor.author | Guntner, R. | en_US |
dc.contributor.author | Scherf, U | en_US |
dc.contributor.corporatename | Georgia Institute of Technology. Center for Organic Photonics and Electronics | en_US |
dc.contributor.corporatename | Universität Potsdam. Institut für Physik | en_US |
dc.contributor.corporatename | University of Arizona. Dept. of Chemistry | en_US |
dc.contributor.corporatename | Technische Universität Graz. Institut für Festkörperphysik | en_US |
dc.contributor.corporatename | Bergische Universität Wuppertal. Fachbereich Chemie | en_US |
dc.contributor.corporatename | Bergische Universität Wuppertal. Fachbereich Makromolekulare Chemie | en_US |
dc.date.accessioned | 2013-04-25T20:34:55Z | |
dc.date.available | 2013-04-25T20:34:55Z | |
dc.date.issued | 2003-10 | |
dc.description | © 2003 American Institute of Physics. The electronic version of this article is the complete one and can be found at: http://dx.doi.org/10.1063/1.1605374 | en_US |
dc.description | DOI: 10.1063/1.1605374 | en_US |
dc.description.abstract | An experimental and theoretical study of the anisotropic optical properties of polyfluorenes (PFs) bearing ketonic defects is presented. Polarized emission experiments performed on photooxidized aligned PF layers indicate that the transition dipole of the ‘‘green’’ CT π-π * transition of the keto-defect is oriented parallel to the chain direction. It is further observed that the polarization ratio of the green emission is slightly smaller than that of the blue emission component originating from undisturbed chains. Quantum mechanical calculations have been performed to support these observations. It is shown that the transition dipole moment of the CT π-π * transition of the defect is slightly misaligned with respect to the π-π* transition of the undisturbed PF chain, and that the angle between both depends on the chain conformation. For the most probably 5/2 helical conformation, this angle is, however, smaller than 5°. Further, polarized PL spectroscopy with polarized excitation has been performed to determine the extent of energy migration prior to emission from the keto-defect. For excitation at 380 nm, the polarization ratio of the green emission is essentially independent of the excitation polarization, indicating almost complete depolarization of the excitation before it is captured at a defect site. In contrast to this, energy migration after direct excitation of the keto-defect is inefficient or even absent. | en_US |
dc.identifier.citation | Yang, X.H. and Neher, D. and Spitz, C. and Zojer, Egbert and Brédas, Jean-Luc and Guntner, R. and Scherf, U., "On the polarization of the green emission of polyfluorenes," Journal of Chemical Physics, 119, 13, 6832-6839 (October 1 2003) | en_US |
dc.identifier.doi | 10.1063/1.1605374 | |
dc.identifier.issn | 0021-9606 | |
dc.identifier.uri | http://hdl.handle.net/1853/46838 | |
dc.publisher | Georgia Institute of Technology | en_US |
dc.publisher.original | American Institute of Physics | en_US |
dc.subject | Polymers | en_US |
dc.subject | Photoluminescence | en_US |
dc.subject | Light polarization | en_US |
dc.subject | Transition moments | en_US |
dc.subject | Charge transfer states | en_US |
dc.subject | Noncrystalline defects | en_US |
dc.title | On the polarization of the green emission of polyfluorenes | en_US |
dc.type | Text | |
dc.type.genre | Article | |
dspace.entity.type | Publication | |
local.contributor.author | Brédas, Jean-Luc | |
local.contributor.corporatename | Center for Organic Photonics and Electronics | |
relation.isAuthorOfPublication | 4d846669-7bb3-480a-8267-9b1cd9ff38d2 | |
relation.isOrgUnitOfPublication | 43f8dc5f-0678-4f07-b44a-edbf587c338f |
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