Device-spectroscopy of magnetic field effects in a polyfluorene organic light-emitting diode

T. D. Nguyen; J. Rybicki; Y. Sheng; M. Wohlgenannt

doi:10.1103/PhysRevB.77.035210

Device-spectroscopy of magnetic field effects in a polyfluorene organic light-emitting diode

Soft Condensed Matter 2009-11-13 v1 Disordered Systems and Neural Networks

Authors: T. D. Nguyen , J. Rybicki , Y. Sheng , M. Wohlgenannt

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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 distinguish between 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 are inconsistent with the exciton formation and triplet-exciton polaron quenching models.

Keywords

organic magnetoresistance polyfluorene organic light-emitting diode charge-induced absorption electroluminescence spectroscopy singlet exciton triplet exciton polaron

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@article{arxiv.0705.3840,
  title  = {Device-spectroscopy of magnetic field effects in a polyfluorene organic light-emitting diode},
  author = {T. D. Nguyen and J. Rybicki and Y. Sheng and M. Wohlgenannt},
  journal= {arXiv preprint arXiv:0705.3840},
  year   = {2009}
}

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4 pages, two figures

Device-spectroscopy of magnetic field effects in a polyfluorene organic light-emitting diode

Abstract

Keywords

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