Journal article
Device spectroscopy of magnetic field effects in a polyfluorene organic light-emitting diode
Physical review. B, Vol.77(3), 035210
05/25/2007
DOI: 10.1103/PhysRevB.77.035210
Abstract
We perform charge-induced absorption and electroluminescence spectroscopy in a polyfluorene organic magnetoresistive device. Our experiments allow us to measure the singlet exciton, triplet exciton, and polaron densities in a live device under an applied magnetic field and to test the predictions of three different models that were proposed to explain organic magnetoresistance. These models are based on different spin-dependent interactions, namely, exciton formation, triplet-exciton polaron quenching, and bipolaron formation. We show that the singlet exciton, triplet exciton, and polaron densities and conductivity all increase with increasing magnetic field. Our data appear to be inconsistent with the exciton formation and triplet-exciton polaron quenching models.
Details
- Title: Subtitle
- Device spectroscopy of magnetic field effects in a polyfluorene organic light-emitting diode
- Creators
- T. D. Nguyen - University of IowaJ. Rybicki - University of IowaY. Sheng - Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USAM. Wohlgenannt - University of Iowa
- Resource Type
- Journal article
- Publication Details
- Physical review. B, Vol.77(3), 035210
- DOI
- 10.1103/PhysRevB.77.035210
- ISSN
- 2469-9950
- eISSN
- 2469-9969
- Publisher
- Amer Physical Soc
- Number of pages
- 5
- Language
- English
- Date published
- 05/25/2007
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984429011502771
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