Absorption-detected magnetic-resonance studies of photoexcitations in conjugated-polymer/C{sub 60} composites

Journal Article · Wed Jan 31 19:00:00 EST 1996 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.53.2187· OSTI ID:278687

Wei, X; Vardeny, Z V ^[1]; Sariciftci, N S; Heeger, A J ^[2]

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1. Department of Physics, University of Utah, Salt Lake City, Utah 84112 (United States)
2. Institute for Polymers and Organic Solids, University of California, Santa Barbara, California 93106 (United States)

Photoexcitations in poly[2-methoxy-5-(2{sup {prime}}-ethyl-hexyloxy)-{ital p}-phenylene vinylene] (MEH-PPV) and composites of MEH-PPV and C{sub 60} (MEH-PPV/C{sub 60}) were studied by photoinduced absorption and absorption-detected magnetic-resonance spectroscopies. We report direct evidence that the prominent triplet photoexcitations in pristine MEH-PPV are effectively quenched in MEH-PPV/C{sub 60}. In contrast, the dominant photoexcitations in MEH-PPV/C{sub 60} are spin-1/2 excitations: polarons on the polymer chains; and polarons on the C{sub 60} (C{sub 60}{sup {minus}}). {copyright} {ital 1996 The American Physical Society.}

• DOE Contract Number: FG03-93ER45490
• OSTI ID: 278687
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 5 Vol. 53; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ABSORPTION SPECTROSCOPY
COMPOSITE MATERIALS
EXCITONS
FULLERENES
MAGNETIC RESONANCE
ORGANIC POLYMERS
POLARONS
TRIPLETS