Electroluminescence-, conductivity-, and photoconductivity-detected magnetic resonance study of poly(p-phenylenevinylene)-based light emitting diodes

L. S. Swanson, J. Shinar, A. R. Brown, D. D.C. Bradley, R. H. Friend, P. L. Burn, A. Kraft, A. B. Holmes

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12 Scopus citations

Abstract

The strong electroluminescence (EL)-detected magnetic resonance of poly(p-phenylenevinylene) (PPV)-based light emitting diodes is compared to the conductivity (σ)-, photoconductivity (σph)- and photoluminescence (PL)-detected resonances. In contrast to the narrow PL-enhancing resonance assigned to polaron fusion into singlet excitons, strong EL- and σ-quenching resonances are attributed to the spin-dependent polaron-to-bipolaron decay. While the half-field PL-detected resonance reveals only one triplet exciton resonance, believed to result from triplet-triplet fusion into singlets, the half-field EL- and σ-detected resonances yield two distinct triplets. While both are σ-enhancing, one is EL-quenching. The nature of the two triplet states is discussed. © 1993.
Original languageEnglish (US)
JournalSynthetic Metals
Volume55
Issue number1
DOIs
StatePublished - Mar 15 1993
Externally publishedYes

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