Spin signatures of exchange-coupled triplet pairs formed by singlet fission

Bayliss, S. L. , Weiss, L. R., Rao, A., Friend, R. H., Chepelianskii, A. D. and Greenham, N. C. (2016) Spin signatures of exchange-coupled triplet pairs formed by singlet fission. Physical Review B, 94(4), 045204. (doi: 10.1103/PhysRevB.94.045204)

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Abstract

We study the effect of an exchange interaction on the magnetic-field-dependent photoluminescence in singlet fission materials. We show that, for strongly interacting triplet exciton pairs (intertriplet exchange interaction greater than the intratriplet spin-dipolar interaction), quantum beating and magnetic-field effects vanish apart from at specific magnetic fields where singlet and quintet levels are mixed by a level anticrossing. We characterize these effects and show that the absence of a magnetic-field effect or zero-field quantum beats does not necessarily mean that fission is inoperative. These results call for a reconsideration of the observations that are considered hallmarks of singlet fission and demonstrate how the spin coherence and exchange coupling of interacting triplet pairs can be measured through magneto-photoluminescence experiments.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Bayliss, Dr Sam
Authors: Bayliss, S. L., Weiss, L. R., Rao, A., Friend, R. H., Chepelianskii, A. D., and Greenham, N. C.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Physical Review B
Publisher:American Physical Society
ISSN:2469-9950
ISSN (Online):2469-9969
Published Online:11 July 2016

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