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, and A. B. Holmes
Phys. Rev. B 46, 15072 – Published 15 December 1992
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Abstract

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.

  • Received 12 June 1992

DOI:https://doi.org/10.1103/PhysRevB.46.15072

©1992 American Physical Society

Authors & Affiliations

L. S. Swanson and J. Shinar

  • Ames Laboratory and Physics and Astronomy Department, Iowa State University, Ames, Iowa 50011

A. R. Brown, D. D. C Bradley, and R. H. Friend

  • Cavendish Laboratory, Cambridge University, Madingley Road, Cambridge CB3 0HE, United Kingdom

P. L. Burn, A. Kraft, and A. B. Holmes

  • Chemistry Department, University Chemical Laboratory, Lensfield Road, Cambridge CB2 1EW, United Kingdom

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Issue

Vol. 46, Iss. 23 — 15 December 1992

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