Transient spectroscopy of excitons and polarons in C[sub 60] films from femtoseconds to milliseconds

Journal Article · Sun Nov 13 23:00:00 EST 1994 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.73.2760· OSTI ID:6769146

Dick, D; Wei, X; Jeglinski, S; Benner, R E; Vardeny, Z V ^[1]; Moses, D; Srdanov, V I; Wudl, F ^[2]

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1. Departments of Physics and Electrical Engineering, University of Utah, Salt Lake City, Utah 84112 (United States)
2. 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), Journal Name: Physical Review Letters; (United States) Vol. 73:20; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360606* -- Other Materials-- Physical Properties-- (1992-)
CARBON
ELEMENTS
EXCITONS
FILMS
FULLERENES
LUMINESCENCE
MAGNETIC RESONANCE
NONMETALS
PHOTO-INDUCED TRANSIENT SPECTROSCOPY
PHOTOLUMINESCENCE
POLARONS
QUASI PARTICLES
RELAXATION TIME
RESONANCE
SPECTROSCOPY
THIN FILMS