Journal
PHYSICAL REVIEW B
Volume 94, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.94.045204
Keywords
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Funding
- Engineering and Physical Sciences Research Council [EP/G060738/1]
- Engineering and Physical Sciences Research Council [1208395, EP/G060738/1, EP/M005143/1, EP/M006360/1] Funding Source: researchfish
- EPSRC [EP/M005143/1, EP/M006360/1, EP/G060738/1] Funding Source: UKRI
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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.
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