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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.
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Swanson et al. (1992) studied this question.
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