Exciton annihilation studies in poly(p-phenylene vinylene)

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To verify the excitonic nature of the light-emitting state in PPV, fluorescence intensities and decay lifetimes were investigated as a function of excitation intensity. The results agree with the behavior predicted by the molecular exciton model. In particular, exciton-exciton annihilation causes the fluorescence intensity to saturate and the fluorescence lifetime to shorten at high exciton densities. In addition, the exciton annihilation, and thus diffusion, coefficients are found to be relatively large, even at low temperatures, indicating that exciton migration is important in PPV. These results indicate that the fluorescent (photoluminescent) state in PPV is excitonic in nature. The results argue ... continued below

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9 p.

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Valencia, V.S.; Kepler, R.G.; Jacobs, S.J.; Beeson, P.M. & Allemond, P.M. August 1, 1995.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM (United States)
    Place of Publication: Albuquerque, New Mexico

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Description

To verify the excitonic nature of the light-emitting state in PPV, fluorescence intensities and decay lifetimes were investigated as a function of excitation intensity. The results agree with the behavior predicted by the molecular exciton model. In particular, exciton-exciton annihilation causes the fluorescence intensity to saturate and the fluorescence lifetime to shorten at high exciton densities. In addition, the exciton annihilation, and thus diffusion, coefficients are found to be relatively large, even at low temperatures, indicating that exciton migration is important in PPV. These results indicate that the fluorescent (photoluminescent) state in PPV is excitonic in nature. The results argue against the band model where high mobility at reduced temperatures is not expected because the light-emitting species, neutral bipolarons, are associated with large lattice distortions.

Physical Description

9 p.

Notes

OSTI as DE95016463

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  • 27. international technical conference of the Society for the Advancement of Material and Process Engineering (SAMPE): diversity into the next century, Albuquerque, NM (United States), 9-12 Oct 1995

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  • Other: DE95016463
  • Report No.: SAND--95-1767C
  • Report No.: CONF-951033--18
  • Grant Number: AC04-94AL85000
  • DOI: 10.2172/102127 | External Link
  • Office of Scientific & Technical Information Report Number: 102127
  • Archival Resource Key: ark:/67531/metadc618983

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  • August 1, 1995

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

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  • April 14, 2016, 3:51 p.m.

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Valencia, V.S.; Kepler, R.G.; Jacobs, S.J.; Beeson, P.M. & Allemond, P.M. Exciton annihilation studies in poly(p-phenylene vinylene), report, August 1, 1995; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc618983/: accessed December 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.