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The strong electroluminescence (EL) -detected magnetic resonance of PPV-based light emitting diodes is compared to the conductivity () - 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 -quenching resonances are attributed to the spin-dependent polaron-to-bipolaron decay. The half-field EL- and -detected resonances of two distinct triplet excitons is believed to result from triplet-triplet fusion to singlets.
Swanson et al. (Tue,) studied this question.
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