Singlet and Triplet Exciton Dynamics of Violanthrone

The exciton dynamics of violanthrone-79 are investigated in solution and in the solid state. In solution, the photoprepared singlet is found to exhibit a strong ground-state bleach and stimulated emission feature, but when sensitized in its triplet state, it exhibits only a narrow and weak ground-st...

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Published inJournal of physical chemistry. C Vol. 125; no. 41; pp. 22464 - 22471
Main Authors Gholizadeh, Elham M, Prasad, Shyamal K. K, Gillan, Lara V, Nielsen, Michael P, Ekins-Daukes, N. J, McCamey, Dane R, Tayebjee, Murad J. Y, Schmidt, Timothy W
Format Journal Article
LanguageEnglish
Published American Chemical Society 21.10.2021
Subjects
C: Energy Conversion and Storage
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Summary:The exciton dynamics of violanthrone-79 are investigated in solution and in the solid state. In solution, the photoprepared singlet is found to exhibit a strong ground-state bleach and stimulated emission feature, but when sensitized in its triplet state, it exhibits only a narrow and weak ground-state bleach. As supported by density functional theory calculations, this is explained by the triplet state having absorptions in the same region, with a similar oscillator strength, as the ground-state molecule. In solid films, the excited singlet is found to survive for up to 200 ps, giving way to a long-lived transient absorption spectrum with characteristics reminiscent of the triplet in solution. This is interpreted in terms of singlet fission in the solid film.
ISSN:1932-7447
1932-7455
DOI:10.1021/acs.jpcc.1c06848