8 December 1995 Optical probes of photoexcitations in fullerene thin films from femtoseconds to milliseconds
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Abstract
We have studied photoexcitations in various fullerene thin films using transient photomodulation and photoluminescence from 100 fs to 50 ms and absorption-detected magnetic resonance (ADMR). We show that singlet Frenkel type 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, identified by the correlation found between their associated optical transitions and ADMR signals with spin 1 and 1/2, respectively.
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Z. Valy Vardeny, Z. Valy Vardeny, Xing Wei, Xing Wei, D. Dick, D. Dick, } "Optical probes of photoexcitations in fullerene thin films from femtoseconds to milliseconds", Proc. SPIE 2530, Fullerenes and Photonics II, (8 December 1995); doi: 10.1117/12.228107; https://doi.org/10.1117/12.228107
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