Triplet exciton lifetime under pressure in "pure anthracene"

S. Arnold, N. Hassan

Research output: Contribution to journalArticle

Abstract

The triplet exciton lifetime in "pure" anthracene crystals is found to decrease by as much as a factor of 3 at room temperature under pressures up to 6.4 kbar and in a reversible fashion. Temperature measurement under pressure from 200 to 400 K show that the effect is due to a state ∼0.3 eV below the exciton band. Experiments with tetracene doped anthracene revealed that trapping by tetracene is increased by a factor of 2 over the same pressure range, indicative of enhanced diffusion. A comparison with the "pure" anthracene effect reveals that pressure enhanced diffusion is insufficient for explaining this effect; the cross section for capture by the 0.3 eV state must change by more than a factor of 4 in going from 1 atm to 6.4 kbar. A triplet excimer is invoked for explaining our results, consistent with earlier work. The pressure dependence of the mean capture cross section for this species is determined.

Original languageEnglish (US)
Pages (from-to)5606-5611
Number of pages6
JournalThe Journal of Chemical Physics
Volume78
Issue number9
DOIs
StatePublished - Jan 1 1983

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ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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