Electroluminescence-detected magnetic-resonance study of polyparaphenylenevinylene (PPV)-based light-emitting diodes

Journal Article · Tue Dec 15 04:00:00 EST 1992 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.46.15072· OSTI ID:6934826

Swanson, L S; Shinar, J ^[1]; Brown, A R; Bradley, D D.C.; Friend, R H ^[2]; Burn, P L; Kraft, A; Holmes, A B ^[3]

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1. Ames Laboratory and Physics and Astronomy Department, Iowa State University, Ames, Iowa 50011 (United States)
2. Cavendish Laboratory, Cambridge University, Madingley Road, Cambridge CB3 0HE (United Kingdom)
3. Chemistry Department, University Chemical Laboratory, Lensfield Road, Cambridge CB2 1EW (United Kingdom)

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.

• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 6934826
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 46:23; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360606 -- Other Materials-- Physical Properties-- (1992-)
665000* -- Physics of Condensed Matter-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTROLUMINESCENCE
EXCITONS
LIGHT EMITTING DIODES
LUMINESCENCE
MAGNETIC RESONANCE
MATERIALS
MULTIPLETS
ORGANIC SEMICONDUCTORS
PHOTOLUMINESCENCE
PHYSICAL PROPERTIES
POLARONS
QUASI PARTICLES
RECOMBINATION
RESONANCE
SEMICONDUCTOR DEVICES
SEMICONDUCTOR DIODES
SEMICONDUCTOR MATERIALS
TRIPLETS