Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 125, Issue 41, Pages 22464-22471Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.1c06848
Keywords
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Funding
- Australian Research Council (Centre of Excellence in Exciton Science) [CE170100026]
- Australian Government [zu57]
- UNSW Scientia Program
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The exciton dynamics of violanthrone-79 were investigated in solution and in the solid state. In solution, the photoprepared singlet showed strong ground-state bleach and stimulated emission features, while the triplet state exhibited only a narrow and weak ground-state bleach when sensitized. In solid films, the excited singlet survived for up to 200 ps, leading to a long-lived transient absorption spectrum reminiscent of the triplet in solution.
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.
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