Electroluminescence-detected magnetic-resonance study of polyparaphenylenevinylene (PPV)-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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Abstract

The strong electroluminescence (EL)-detected magnetic resonance of PPV-based light emitting diodes is compared to the conductivity (σ)- and photoluminescence (PL)-detected resonances. It provides direct evidence that polaron-to-singlet exciton conversion is responsible for the EL. In contrast to the narrow PL-enhancing resonance assigned to polaron recombination, strong EL- and σ-quenching resonances are attributed to the spin-dependent polaron-to-bipolaron decay. The half-field EL- and σ-detected resonances of two distinct triplet excitons is believed to result from triplet-triplet fusion to singlets. © 1992 The American Physical Society.
Original languageEnglish (US)
JournalPhysical Review B
Volume46
Issue number23
DOIs
StatePublished - Jan 1 1992
Externally publishedYes

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