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APS » Journals » Phys. Rev. Lett. » Volume 73 » Issue 20
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Phys. Rev. Lett. 73, 2760–2763 (1994)

Transient Spectroscopy of Excitons and Polarons in C60 Films from Femtoseconds to Milliseconds

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D. Dick, X. Wei, S. Jeglinski, R. E. Benner, and Z. V. Vardeny
Departments of Physics and Electrical Engineering, University of Utah, Salt Lake City, Utah 84112

D. Moses, V. I. Srdanov, and F. Wudl
Institute of Polymers and Organic Solids, University of California, Santa Barbara, California 93106

Received 27 August 1993; revised 31 May 1994; published in the issue dated 14 November 1994

We have studied photoexcitations in C60 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 (C60±), identified by the correlation found between their associated optical transitions and ADMR signals with spin 1 and ½, respectively.

© 1994 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.73.2760
DOI:
10.1103/PhysRevLett.73.2760
PACS:
78.47.+p, 71.35.+z, 72.20.Jv, 76.70.Hb
 
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