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14 May 1992 Spin-dependent spectroscopy of photoexcitations in conducting polymers and fullerenes
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We have used the novel technique of absorption detected magnetic resonance (ADMR) to investigate the photoexcitation properties in conducting polymers and fullerene C60 films. In conducting polymers we have identified both charged and neutral long-lived photoexcitations with distinct different properties in polymers with degenerate (trans polyacetylene; t-(CH)x) and nondegenerate (polyparaphenylene vinylene; PPV) ground state backbone structure. In t-(CH)x the photocarriers are charged solitons and the neutral photoexcitations are spin ½ soliton pairs, whereas the photoexcitations in PPV form charge bipolarons and triplet excitons. The neutral photoexcitations in C60/polystyrene "glass" are triplet excitons identified in ADMR through the triplet "powder-pattern" around g = 2.003.
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Xing Wei, Z. Valy Vardeny, and Bret C. Hess "Spin-dependent spectroscopy of photoexcitations in conducting polymers and fullerenes", Proc. SPIE 1636, Applied Spectroscopy in Materials Science II, (14 May 1992);

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