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Опубликовано 2009-06-15 Опубликовано на SciPeople2009-07-19 17:18:45 ЖурналJ. Phys. Chem. C.

Coherent Mechanism of Exciton Transport in Disordered J-Aggregates
A.N. Lebedenko, R.S. Grynyov, G.Ya. Guralchuk, A.V. Sorokin, S.L. Yefimova, Y.V. Malyukin / Александр Сорокин
J. Phys. Chem. C., 2009 Volume 113, Issue 29 P. 12883–12887
Аннотация Using a luminescent exciton trap, a mechanism of the exciton migration in disordered J-aggregates of amphiphilic analogue of pseudoisocyanine (amphi-PIC) dye has been investigated in the temperature range of 80 – 300 K. Due to a strong topological disorder in amphi-PIC J-aggregates observed in a binary dimethylformamide-water (DMF/W) solution with a low water content, two types of excitonic states have been revealed: delocalized exciton state that forms the main part of the J-aggregates absorption band (J-band), and a state of strongly localized excitons that forms the long-wavelength edge of the J-band. These excitonic states are characterized by the different mechanism of the exciton transport: a coherent mechanism for delocalized excitons and an incoherent one for localized excitons. As localized excitons provide a small contribution to the J-band and appear only at high degree of topological disorder, the coherent mechanism of the exciton transport in amphi-PIC J-aggregates has been concluded. Such a result is non-trivial due to a small delocalization length of excitons in amphi-PIC J-aggregates (11 monomers at 80 K) provided by the moderate energetic disorder and strong exciton-phonon coupling.
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