Abstract
Energy transfer and fusion annihilation of the triplet exciton were studied in anthracene crystals using delayed fluorescence. The decay rates of the exciton via monomolecular and bimolecular processes (β and γ, respectively) were measured at temperatures between 90-400 K. As predicted by kinetic analysis including the exciton-trapping effect, the same temperature dependence was obtained on β and γ by eliminating the following thermal effects on the diffusion and fusion-annihilation rates. The energy transfer to traps was diffusion limited, and the diffusion rate decreased by a factor of about 3 on heating from 90 to 400 K. The fusion-annihilation rates between free and trapped excitons, which were about 105 times larger than that between two free excitons, increased as the temperature was raised. The mechanism of the free-trapped fusion must be dominated by some long-range interaction.
| Original language | English |
|---|---|
| Pages (from-to) | 3318-3324 |
| Number of pages | 7 |
| Journal | The Journal of Chemical Physics |
| Volume | 86 |
| Issue number | 6 |
| Publication status | Published - 1987 |
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ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
Cite this
Thermal effects on triplet exciton processes in anthracene crystals. / Yokoi, Kohei; Ohba, Yujiro.
In: The Journal of Chemical Physics, Vol. 86, No. 6, 1987, p. 3318-3324.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Thermal effects on triplet exciton processes in anthracene crystals
AU - Yokoi, Kohei
AU - Ohba, Yujiro
PY - 1987
Y1 - 1987
N2 - Energy transfer and fusion annihilation of the triplet exciton were studied in anthracene crystals using delayed fluorescence. The decay rates of the exciton via monomolecular and bimolecular processes (β and γ, respectively) were measured at temperatures between 90-400 K. As predicted by kinetic analysis including the exciton-trapping effect, the same temperature dependence was obtained on β and γ by eliminating the following thermal effects on the diffusion and fusion-annihilation rates. The energy transfer to traps was diffusion limited, and the diffusion rate decreased by a factor of about 3 on heating from 90 to 400 K. The fusion-annihilation rates between free and trapped excitons, which were about 105 times larger than that between two free excitons, increased as the temperature was raised. The mechanism of the free-trapped fusion must be dominated by some long-range interaction.
AB - Energy transfer and fusion annihilation of the triplet exciton were studied in anthracene crystals using delayed fluorescence. The decay rates of the exciton via monomolecular and bimolecular processes (β and γ, respectively) were measured at temperatures between 90-400 K. As predicted by kinetic analysis including the exciton-trapping effect, the same temperature dependence was obtained on β and γ by eliminating the following thermal effects on the diffusion and fusion-annihilation rates. The energy transfer to traps was diffusion limited, and the diffusion rate decreased by a factor of about 3 on heating from 90 to 400 K. The fusion-annihilation rates between free and trapped excitons, which were about 105 times larger than that between two free excitons, increased as the temperature was raised. The mechanism of the free-trapped fusion must be dominated by some long-range interaction.
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M3 - Article
AN - SCOPUS:36549103356
VL - 86
SP - 3318
EP - 3324
JO - Journal of Chemical Physics
JF - Journal of Chemical Physics
SN - 0021-9606
IS - 6
ER -