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Volumn 110, Issue 15, 2006, Pages 7732-7742

Electrofluorescence of MEH-PPV and its oligomers: Evidence for field-induced fluorescence quenching of single chains

Author keywords

[No Author keywords available]

Indexed keywords

ELECTRIC FIELD EFFECTS; ELECTROLUMINESCENCE; ELECTRONIC PROPERTIES; EXCITONS; MATHEMATICAL MODELS; OLIGOMERS; QUENCHING;

EID: 33646456915     PISSN: 15206106     EISSN: None     Source Type: Journal    
DOI: 10.1021/jp054264p     Document Type: Article
Times cited : (26)

References (101)
  • 11
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    • Roitman, D. B.; Sheats, J. R. In U. S.; Agilent Technologies, Inc.: Palo Alto, CA, 2000; p 6
    • Roitman, D. B.; Sheats, J. R. In U. S.; Agilent Technologies, Inc.: Palo Alto, CA, 2000; p 6.
  • 13
    • 84906374824 scopus 로고    scopus 로고
    • Hide, F., 1997
    • Hide, F., 1997.
  • 24
    • 0001269334 scopus 로고
    • Lim, E. C., Ed.; Academic Press: New York
    • Liptay, W. In Excited States; Lim, E. C., Ed.; Academic Press: New York, 1974; Vol. 1, pp 129-229.
    • (1974) Excited States , vol.1 , pp. 129-229
    • Liptay, W.1
  • 53
    • 0037119105 scopus 로고    scopus 로고
    • Lagowski, J. B. THEOCHEM 2002, 589-590, 125-137.
    • (2002) THEOCHEM , vol.589-590 , pp. 125-137
    • Lagowski, J.B.1
  • 72
    • 84906360528 scopus 로고    scopus 로고
    • note
    • Fluorescence excitation anisotropy experiments were performed on various oligomers. Energy transfer between oligomers as a result of aggregation would lead to increased steady-state fluorescence depolarization. Steady-state anisotropy values of 0.25 ± 0.05 were measured for the OPPVs as would be expected from isolated chromophores.
  • 93
    • 84906403460 scopus 로고    scopus 로고
    • note
    • b) as an energy criterion to exciton dissociation. According to the authors, an optical excitation (exciton) can dissociate if the gain of electrostatic energy is sufficient to (1) stabilize separation of charge carriers, and (2) prevent their recombination within the Coulomb potential well. In eq 6 of the current report, we consider exciton dissociation to be a ID Onsager-like process where dissociation occurs on-chain in the oligomers if the energy difference between the exciton in a strong external field (first term) exceeds its Coulombic binding energy (second term).
  • 96
    • 0000082081 scopus 로고
    • In MTHF, low-temperature dielectric measurements by Richert et al. [Chem. Phys. Lett. 1993, 216, 223] taken below the solvent glass transition temperature have shown the dielectric constant increases from ∼1.4 at 298 K to ∼19 at 77 K. Maxwell's dispersion relationship, used in eq 6 to estimate the dielectric constant of MTHF, becomes less valid as the solvent temperature decreases. The effect of increasing the dielectric constant in eq 6 would be to reduce the exciton binding potential by an order of magnitude, making exciton dissociation more probable in the presence of an applied field.
    • (1993) Chem. Phys. Lett. , vol.216 , pp. 223
    • Richert1
  • 97
    • 84906360105 scopus 로고    scopus 로고
    • note
    • Delocalization length (∼5.2 Å) of 1 PV unit was calculated in CS Chem3D Ultra version 6.0 using CS MOPAC Pro with the AM1 Hamiltonian. The structure was highly planar (RMS deviation ∼0.005 Å). Distances were measured between the para-carbon opposite the vinyl group and the outermost vinyl carbon. The best estimate for the short molecular axis of 1 PV for this geometry is 2.6 Å.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.