Elucidating the role of hyperfine interactions on organic magnetoresistance using deuterated aluminium tris(8-hydroxyquinoline)

TL;DR

This study investigates the influence of hyperfine interactions on organic magnetoresistance, demonstrating that proton hyperfine coupling is not the cause, and proposing unpaired electron interactions as a possible explanation.

Contribution

The paper provides experimental evidence that hyperfine coupling with protons does not cause organic magnetoresistance, highlighting the potential role of unpaired electrons.

Findings

Hyperfine coupling with protons is not responsible for organic magnetoresistance.

Unpaired electrons may play a significant role in the effect.

Deuteration of aluminium tris(8-hydroxyquinoline) affects magnetoresistance measurements.

Abstract

Measurements of the effect of a magnetic field on the light output and current through an organic light emitting diode made with deuterated aluminium tris(8-hydroxyquinoline) have shown that hyperfine coupling with protons is not the cause of the intrinsic organic magnetoresistance. We suggest that interactions with unpaired electrons in the device may be responsible.