A relationship between the orientation degree of dye molecules in stretched polyvinyl alcohol films and the concentration of these molecules is found. The electron excitation energy migration among the dye molecules in isotropic and oriented polymer matrices as a function of the molecule concentration is investigated. The results obtained can be attributed to partial reduction of the inhomogeneous spectral broadening of electron levels in luminescent molecules under the activator molecule orientation in the polymer matrix.
Department of General Physics, Faculty of Physics, Moscow State University, Leninskie Gory, Moscow, 119992, Russia
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