Abstract
We present magnetoconductivity and magnetoluminescence measurements in sandwich devices made from the -conjugated molecule tris-(8-hydroxyquinoline) aluminum and demonstrate effects of more than 25% and 50% magnitude, respectively. These effects are known to be caused by hyperfine coupling in pairs of paramagnetic species, and it is often assumed that these are electron-hole pairs. However, we show that the very large magnitude of the effect contradicts present knowledge of the electron-hole pair recombination processes in electroluminescent -conjugated molecules and that the effect persists even in almost hole-only devices.
- Received 28 February 2008
DOI:https://doi.org/10.1103/PhysRevB.77.235209
©2008 American Physical Society