Magneto-dielectric effects induced by optically-generated intermolecular charge-transfer states in organic semiconducting materials.

ABSTRACT: Traditionally, magneto-dielectric effects have been developed by combining ferroelectric and magnetic materials. Here, we show a magneto-dielectric effect from optically-generated intermolecular charge-transfer states in an organic semiconducting donor:acceptor (PVK:TCNB) system. We observe in magnetic field effects of photoluminescence that a magnetic field can change singlet/triplet population ratio in intermolecular charge-transfer states. Furthermore, our theoretical analysis and experimental evidence indicate that the singlets and triplets in charge-transfer states have stronger and weaker electrical polarizations, respectively. Therefore, the observed magneto-dielectric effect can be attributed to magnetically-dependent singlet/triplet ratio in intermolecular charge-transfer states.

SUBMITTER: Zang H 

PROVIDER: S-EPMC3788370 | biostudies-literature | 2013 Oct

REPOSITORIES: biostudies-literature