Abstract
Time resolved spectroscopy and fluorescence decay time measurements have been made on thin films of amorphous polyvinyl carbazole (PVK). The value obtained for the excimer fluorescence decay time in the undoped sample is less than that reported previously and a wavelength dependent double exponential decay is observed, which has been seen before only at low temperatures. The observed quenching of the excimer fluorescence decay times in the doped samples is evidence of direct energy transfer from excimers to perylene which is inconsistent with the model of energy transfer by exciton diffusion proposed to explain intensity quenching data. Several models for energy transfer in PVK are discussed and it is shown that the only model which predicts the observed time resolved spectroscopy results requires a long range resonant interaction strength much greater than that obtained theoretically. Several possible reasons for this are discussed.
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