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

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

2007-05-25

arxiv.org/abs/0705.3840v1

Physics

Condensed Matter

Soft Condensed Matter

4 pages, two figures

Scientific paper

10.1103/PhysRevB.77.035210

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.

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