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Kinetics of the Decay of Excited Singlet State into a Pair of T-Excitons in Rubrene Films: Mechanism and Manifestation of Exciton Migration
- Authors: Shushin A.I.1, Umanskii S.Y.1, Chaikina Y.A.1
-
Affiliations:
- Federal Research Center for Chemical Physics, Russian Academy of Sciences
- Issue: Vol 42, No 12 (2023)
- Pages: 75-80
- Section: ХИМИЧЕСКАЯ ФИЗИКА НАНОМАТЕРИАЛОВ
- URL: https://vestnikugrasu.org/0207-401X/article/view/675015
- DOI: https://doi.org/10.31857/S0207401X23120105
- EDN: https://elibrary.ru/XTMPPU
- ID: 675015
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Abstract
The kinetics of the decay (splitting) of the excited singlet -state of rubrene molecules into a pair of
triplet-excitons (T-excitons) in rubrene films, usually represented in terms of the kinetics of the decay of fluorescence
(KDF) from the -state, is analyzed in detail. The KDF is known to be significantly controlled by
the process of diffusive migration and annihilation of the generated T-excitons. In the analysis, two migration
models are considered: the two-state model (TSM), treating the migration effect as a result of transitions
between the [TT] state of coupled T-excitons (at small TT-distances r) and the [T+T]-state of freely migrating
Е-excitons (at large distances r), as well as the free migration model (FMM), neglecting the effect of the [TT]
state. Within the TSM and FMM, the expressions for are derived, which are applied to describe the KDF ,
measured in amorphous rubrene films. Within the experimentally investigated range of times, , the TSM is
shown to reproduce the behavior of the experimental KDF much more accurately than the FMM. At longer
times a substantial difference () between and the FMM-predicted KDF is found, which is far beyond the
experimental error (3%).
Keywords
About the authors
A. I. Shushin
Federal Research Center for Chemical Physics, Russian Academy of Sciences
Email: shushin@chph.ras.ru
Moscow, Russia
S. Ya. Umanskii
Federal Research Center for Chemical Physics, Russian Academy of Sciences
Email: shushin@chph.ras.ru
Moscow, Russia
Yu. A. Chaikina
Federal Research Center for Chemical Physics, Russian Academy of Sciences
Author for correspondence.
Email: shushin@chph.ras.ru
Moscow, Russia
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