Fizika Nizkikh Temperatur: Volume 44, Number 1 (January 2018), p. 86-90    ( to contents , go back )

Features of light absorption by a low-dimensional disordered molecular aggregate

I.Yu. Ropakova

Institute for Scintillation Materials, STC “Institute for Single Crystals” of the National Academy of Sciences of Ukraine 60 Nauky Ave., Kharkov 61001, Ukraine

A.A. Zvyagin

B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Nauky Ave., Kharkiv 61103, Ukraine

Max-Planck-Institut für Physik komplexer Systeme, 38 Nöthnitzer Str., Dresden D-01187, Germany
E-mail: zvyagin@ilt.kharkov.ua

Received Jule 10, 2017

Abstract

Absorption of light by the exciton system of quantum molecular low-dimensional complexes (aggregates) is studied theoretically. It is shown that in the ground state rather small level of randomness of the impurities of H-aggregates to the chain of J-aggregates causes essential weakening of the intensity of the ab-sorption of the J-band (together with the onset of the H-band). Further growth of the level of randomness of the impurities does not yield any essential reconstruction of the absorption spectrum of the system. In the case of the total randomness the absorption is absent.

PACS: 71.35.Aa Frenkel excitons and self-trapped excitons;
PACS: 78.67.Sc Nanoluminophors, nanocomposites.

Key words: Frenkel excitons, J-aggregates, luminescent substances, disorder.

Published online: November 28, 2017

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