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Singlet and Triplet Exciton Dynamics of Violanthrone
preprintsubmitted on 29.03.2021, 03:41 and posted on 30.03.2021, 12:49 by Elham Gholizadeh, Shyamal Prasad, Lara Gillan, Dane R. McCamey, Murad J. Y. Tayebjee, Timothy Schmidt
The exciton dynamics of violanthrone-79 are investigated in solution and in the solid
state. In solution, the photo-prepared singlet is found to exhibit a strong ground-state bleach
and stimulated emission feature, but when sensitized in its triplet state, 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 only 100 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.
ARC Centre of Excellence in Exciton Science
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