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The relative quantum yields of the host and guest fluorescence in anthracene-tetracene mixed crystals have been measured for tetracene concentrations  c T between 10 -6  and 10 -1  mol/mol and temperatures below and above the temperature region, where the energy transfer is partially quenched by shallow traps (35°K) . The concentration dependence of the quantum ratio is measured as Q T /Q A  = k •  cT  p , where the exponent p is nearly 1 and k is measured as 6 · 10 4  and explained as the ratio  τ W/ t H ( τ W is the decay time of the host fluorescence and  t H the hopping time) . The fraction of transfer which is quenched at lowest temperatures is independent of the tetracene concentration. The results are compared with the exciton diffusion mechanism for energy transfer (hopping model) .

Die Konzentrationsabhängigkeit der Energie-Übertragung in Anthracen-Tetracen-Mischkristallen