Transient spectroscopy of excitons and polarons in C[sub 60] films from femtoseconds to milliseconds
Journal Article
·
· Physical Review Letters; (United States)
- Departments of Physics and Electrical Engineering, University of Utah, Salt Lake City, Utah 84112 (United States)
- Institute of Polymers and Organic Solids, University of California, Santa Barbara, California 93106 (United States)
We have studied photoexcitations in C[sub 60] films using transient photomodulation and photoluminescence from 100 fs to 50 ms and absorption-detected magnetic resonance (ADMR). We show that singlet Frenkel excitons are the primary photoexcitations; their recombination kinetics in the picosecond time domain are dispersive as a result of inhomogeneity. The long-lived photoexcitations, however, are shown to be triplet excitons and charged polarons (C[sub 60][sup [minus plus]]), identified by the correlation found between their associated optical transitions and ADMR signals with spin 1 and 1/2, respectively.
- DOE Contract Number:
- FG03-93ER45490
- OSTI ID:
- 6769146
- Journal Information:
- Physical Review Letters; (United States), Vol. 73:20; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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