Abstract
Optical dephasing of pentacene dimers in p-terphenyl is studied. Dimer statesR 3 and R 4 exhibit an exponential temperature activation of T′ 2 which is inconsistent with a mechanism involving scattering between delocalized dimer states. Other dephasing mechanisms are discussed. An upper limit is placed on the relaxation rate from the upper dimer state, R 1, to R 3
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