Abstract
Sensitized fluorescence in amorphous anthracene-tetracene layers formed by vacuum-sublimation onto 77 K substrates is investigated as a function of tetracene concentration, sample temperature and annealing conditions. It is found that in the temperature range 77 to 130 K host-guest energy transfer in unannealed samples occurs by Förster long range coupling between anthracene excimers and single tetracene molecules. The experimental transfer distance R 0 = 28.7 ± 2.3 Å is in fair agreement with the calculated value R 0, theor = 25.8 ± 1.6 Å. Population of the excimer-forming sites must involve singlet exciton motion through the host matrix.
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