Thermal effects on triplet exciton processes in anthracene crystals

Kohei Yokoi, Yujiro Ohba

Research output: Contribution to journalArticle

6 Citations (Scopus)

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 languageEnglish
Pages (from-to)3318-3324
Number of pages7
JournalThe Journal of Chemical Physics
Volume86
Issue number6
Publication statusPublished - 1987

Fingerprint

anthracene
Thermal effects
temperature effects
excitons
Fusion reactions
Crystals
fusion
crystals
Energy transfer
energy transfer
Temperature
decay rates
Fluorescence
trapping
LDS 751
traps
Heating
fluorescence
temperature dependence
Kinetics

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 journalArticle

Yokoi, Kohei ; Ohba, Yujiro. / Thermal effects on triplet exciton processes in anthracene crystals. In: The Journal of Chemical Physics. 1987 ; Vol. 86, No. 6. pp. 3318-3324.
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