Photoluminescence-detected magnetic-resonance study of fullerene-doped {pi}-conjugated polymers
- Ames Laboratory-United States Department of Energy and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011 (United States)
- Faculty of Engineering, Osaka University, Yamada-Oka 2-1 Suita (Japan)
{ital X}-band photoluminescence (PL)-detected magnetic resonance (PLDMR) spectra of C{sub 60}- and C{sub 70}-doped 2,5-dihexoxy poly({ital p}-phenylenevinylene) (DHO-PPV), 2,5-dibutoxy poly({ital p}-phenylene ethynylene) (DBO-PPE), and poly(3-dodecylthiophene) (P3DT) are described and discussed. While light doping of DHO-PPV by both fullerenes quenches the PL, both the polaron and triplet exciton resonances are dramatically enhanced. This is attributed to the creation of conformational defects which enhance the fission of 1{sup 1}{ital B}{sub {ital u}} singlet excitons to polaron pairs and intersystem crossing to 1{sup 3}{ital B}{sub {ital u}} triplet excitons. The triplet resonance in all polymers is quenched at relatively low doping levels of C{sub 60} and C{sub 70}, which is attributed to quenching of triplets by positive polarons injected onto the polymer chain. Increased doping by C{sub 60}, but not C{sub 70}, quenches the polaron resonance, also due to photoinduced charge transfer.
- Research Organization:
- Ames National Laboratory
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 383843
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 54, Issue 13; Other Information: PBD: Oct 1996
- Country of Publication:
- United States
- Language:
- English
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