We measure the dielectric confinement length scales of triplet excitons in organic semiconductors by jointly measuring their microwave-domain electric and magnetic susceptibilities. We apply this technique to characterize triplet excitons in two singlet fission materials with distinct solid-state packing and correlate the extracted localization length scales with the role of the excitonic environment. By using the magnetic susceptibility simultaneously determined through our experiments, we compare the independently extracted dielectric and spin-spin localization length scales, highlighting the role of local anisotropy on the properties of excitonic triplet states.

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Published in Physical Review B, v. 92, no. 11, article 115432, p. 1-7.

©2015 American Physical Society

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We acknowledge support from the Engineering and Physical Sciences Research Council (Grant No. EP/G060738/1), the Royal Society International Exchange Scheme and Investissements d’Avenir du LabEx PALM (ANR-10-LABX- 0039-PALM). A.D.C. acknowledges support from and St. Catharine’s College, Cambridge. S.L.B. is grateful for support from the EPSRC Supergen SuperSolar Project, and Magdalene College, Cambridge.

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