Perdeuterated Conjugated Polymers for Ultralow-Frequency Magnetic Resonance of OLEDs.

ABSTRACT: The formation of excitons in OLEDs is spin dependent and can be controlled by electron-paramagnetic resonance, affecting device resistance and electroluminescence yield. We explore electrically detected magnetic resonance in the regime of very low magnetic fields (<1 mT). A pronounced feature emerges at zero field in addition to the conventional spin- 1/2 Zeeman resonance for which the Larmor frequency matches that of the incident radiation. By comparing a conventional π-conjugated polymer as the active material to a perdeuterated analogue, we demonstrate the interplay between the zero-field feature and local hyperfine fields. The zero-field peak results from a quasistatic magnetic-field effect of the RF radiation for periods comparable to the carrier-pair lifetime. Zeeman resonances are r

SUBMITTER: Milster S 

PROVIDER: S-EPMC7317727 | biostudies-literature | 2020 Jun

REPOSITORIES: biostudies-literature