Electroluminescence-Detected Magnetic-Resonance Study Of Polyparaphenylenevinylene (Ppv)-Based Light-Emitting-Diodes

TitleElectroluminescence-Detected Magnetic-Resonance Study Of Polyparaphenylenevinylene (Ppv)-Based Light-Emitting-Diodes
Publication TypeJournal Article
Year of Publication1992
AuthorsSwanson, L. S., Shinar J., Brown A. R., Bradley D. D. C., Friend R. H., Burn P. L., Kraft A., and Holmes A. B.
JournalPhysical Review B
Volume46
Issue23
Pagination15072–15077
Date Publisheddec
AbstractThe strong electroluminescence (EL)-detected magnetic resonance of PPV-based light emitting diodes is compared to the conductivity (sigma)- 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 sigma-quenching resonances are attributed to the spin-dependent polaron-to-bipolaron decay. The half-field EL- and sigma-detected resonances of two distinct triplet excitons is believed to result from triplet-triplet fusion to singlets.