Dispersion of Lifetimes of Excited States of Single Molecules in Organic Matrices at Ultralow Temperaturesстатья
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Дата последнего поиска статьи во внешних источниках: 23 января 2020 г.
Аннотация:Fluorescence excitation spectra of single terrylene molecules in transparent naphthalene and polyethylene matrices at ultralow (30-100 mK) temperatures have been studied under the conditions where the widths of zero-phonon spectral lines are determined only by the lifetime T-1 of the excited electronic state. The experimentally observed dispersion of T-1 values for identical molecules is attributed to local field effects, which are responsible for the dependence of T-1 on the effective value of refractive index n of the matrix, which is characteristic of the localization region of each molecule. It has been shown that the dependence T-1(n) for ensembles of point emitters in organic matrices is satisfactorily explained within the model of a virtual cavity around the emitter inside a continuous medium, as well as within the developed quantum kinetic approach including various contributions of the local environment to the lifetime T-1. The recalculation of average T-1 values to the corresponding n values with the use of the expressions obtained for T-1(n) has shown that the difference of the calculated refractive indices of naphthalene and polyethylene from the well-known tabulated n values is less than 1%.