Australian Journal of Chemistry Australian Journal of Chemistry Society
An international journal for chemical science

Exciton fission and annihilation in crystalline tetracene

GR Fleming, DP Millar, GC Morris, JM Morris and GW Robinson

Australian Journal of Chemistry 30(11) 2353 - 2359
Published: 1977


The time-resolved fluorescence of tetracene crystals excited by a single 7-ps pulse of 530-nm light has been measured with a streak camera/OMA system. The singlet exciton lifetime was found to be 300±30 ps at 293 K. Singlet-singlet exciton annihilation was observed, and the rate constant found to be 5 x 10-9 cm3 s-1. In order to fit the observed decay curves, an upper limit of c. 1 x 10-9 cm3 s-1 must be set on the singlet-triplet exciton annihilation rate. The measured singlet-singlet exciton annihilation rate is consistent with a hopping model for singlet exciton motion at room temperature.

© CSIRO 1977

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