Electroluminescence-Detected, Conductivity-Detected, And Photoconductivity-Detected Magnetic-Resonance Study Of Poly(P-Phenylenevinylene)-Based Light-Emitting-Diodes

TitleElectroluminescence-Detected, Conductivity-Detected, And Photoconductivity-Detected Magnetic-Resonance Study Of Poly(P-Phenylenevinylene)-Based Light-Emitting-Diodes
Publication TypeJournal Article
Year of Publication1993
AuthorsSwanson, L. S., Shinar J., Brown A. R., Bradley D. D. C., Friend R. H., Burn P. L., Kraft A., and Holmes A. B.
JournalSynthetic Metals
Volume55
Issue1
Pagination241–248
Date Publishedmar
AbstractThe strong electroluminescence (EL)-detected magnetic resonance of poly(p-phenylenevinylene) (PPV)-based light emitting diodes is compared to the conductivity (sigma)-, photoconductivity (sigma(ph))- and photoluminescence (PL)-detected resonances. In contrast to the narrow PL-enhancing resonance assigned to polaron fusion into singlet excitons, strong EL- and sigma-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 sigma-detected resonances yield two distinct triplets. While both are sigma-enhancing, one is EL-quenching. The nature of the two triplet states is discussed.