Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 10, Issue 24, Pages 7623-7628Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.9b03029
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Funding
- JSPS, Japan [18H01937]
- Grants-in-Aid for Scientific Research [18H01937] Funding Source: KAKEN
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We clarify the mechanism that leads to extended exciton diffusion length in organic materials which exhibit a strong anisotropy of electronic coupling. We analyze the cooperative effects of singlet fission and triplet-triplet annihilation in the exciton diffusion by means of the dynamic Monte Carlo simulations. As a model system, we consider the rubrene crystal which exhibits a long-range exciton diffusion. The deexcitation of the singlet exciton is suppressed by singlet -> triplet conversion via singlet fission. Even though the triplet exciton would hardly diffuse along the c-axis in the rubrene crystal (perpendicular to the high mobility plane) because of the small electronic coupling, the regeneration of the singlet exciton via triplet-triplet annihilation enables long-range exciton diffusion along the c-axis. This singlet revival mechanism can extend the overall lifetime and the diffusion length of the exciton, through back-and-forth transitions between an isotropically diffusing singlet exciton and a long-lived triplet exciton.
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