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Photoinduced polarons in solid films of polymer:fullerene blends were studied by photoluminescence (PL), photoinduced absorption (PIA) and electron spin resonance (ESR). The donor materials used were P3HT and MEH‐PPV. As acceptors we employed PC 60 BM as reference and various soluble C 70 ‐derivates: PC 70 BM, two different diphenylmethano‐[70]fullerene oligoether (C 70 ‐DPM‐OE) and two dimers, C 70 –C 70  and C 60 –C 70 . Blend films containing C 70  revealed characteristic spectroscopic signatures not seen with C 60 . Light‐induced ESR showed signals at  g  ≥ 2.005, assigned to an electron localized on the C 70  cage. The formation of C 70  radical anions also leads to a subgap PIA band at 0.92 eV, hidden in the spectra of C 70 ‐based P3HT and MEH‐PPV blends, which allows for more exact studies of charge separated states in conjugated polymer:C 70  blends. (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Photoinduced C 70 radical anions in polymer:fullerene blends