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

Research output: Contribution to journalArticle

Abstract

The 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.

Original languageEnglish
Pages (from-to)15072-15077
Number of pages6
JournalPhysical Review B: Condensed Matter and Materials Physics
Volume46
Issue number23
Publication statusPublished - 15 Dec 1992

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