Modelling quenching mechanisms of disordered molecular systems in the presence of molecular aggregates

Abstract

The exciton density dynamics recorded in time-resolved spectroscopic measurements is a useful tool to recover information on energy transfer (ET) processes that can occur at different timescales, up to the...

Exciton annihilation and diffusion length in disordered multichromophoric nanoparticles

“…5(C) and eqn (7)). We propose that also collisional quenching – itself boosted by large exciton diffusivity – is the mechanism for the onset of shorter-lived exciton sub-populations, 87 as a function of dye concentration (Fig. 3(B)).…”

Concentration Quenching of Fluorescence Decay Kinetics of Molecular Systems

“…Fluorescence concentration quenching is a phenomenon when the fluorescence quantum yield decreases upon increasing molecular concentration. It has been investigated since the middle of the previous century − and still remains an active research topic. − Concentration quenching has been observed in different chlorophyll systems. ,, Rather remarkably, no concentration quenching is observed in in vivo photosynthetic systems, even though in vitro systems of similar concentrations exhibit severe fluorescence quenching . Since concentration quenching results in energy loss and lower fluorescence yield, for practical applications, it has to be controlled and limited. − This requires a detailed knowledge and understanding of many different facets of this phenomenon.…”