Phonon-induced splitting of exciton lines in MgO and BeO.
Exciton line splitting in MgO and BeO induced by exciton-phonon coupling, comparing splitting with longitudinal optical phonon energy
Loh, E.↗
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Superradiance of J-Aggregated 2,2'-Cyanine Absorbed onto a Vesicle Surface
Phospholipid vesicles are used as substrates to form adsorbed aggregates of 2,2'-cyanine, also referred to as pseudoisocyanine (PIC). In this paper, we report photophysical parameters of two putative adsorbed aggregates species (cis- and trans-aggregates, relating to their makeup from mono-cis and all-transstereoisomers, respectively). Phase modulation picosecond fluorescence decay measurements reveal that superradiance and energy transfer are dominant features controlling photophysical processes. Superradiance, coherence size, energy transfer and exciton-phonon coupling are discussed for the two types of aggregates; as regards photophysical parameters, the fluorescence lifetimes, fluorescence quantum yields, and nonradiative rate constants are determined. It is suggested that structure plays the crucial role in excited state dynamics.
Akins, Daniel L.↗