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Abstract: Multistep energy migration was studied for 3,3′-diethyl-9-methylthiacarbocyanine iodide (MDTCI) in uniaxially stretched and unstretched poly(vinyl alcohol) films. At low and intermediate concentrations fluorescence anisotropy decay measurements yield completely different results for disordered and ordered systems due to strong redistribution and angular correlation of fluorophores transition moments in ordered polymer matrix. These results and other selected properties of energy transport in uniaxially stretched polymer films were analyzed using the technique of Monte–Carlo simulation. [Copyright &y& Elsevier]

Abstract: Fluorescence anisotropy decay in the presence of forward and back energy transfer is studied for rhodamine 6G (donor)–rhodamine B (acceptor) rigid system. Experimental data are compared with the results of Monte-Carlo simulations. Good agreement between experimental data and Monte-Carlo simulations has been obtained. Monte-Carlo simulation of emission anisotropy is performed using an originally elaborated by us hybrid method, which is characterized by much better accuracy and little time consumption. [Copyright &y& Elsevier]