PERCOLATION OF TRIPLET EXCITATION IN RESTRICTED GEOMETRIES

Migration of benzophenone triplet excitations in polymethylmethacrylat e and methylmethacrylate-styrene copolymer has been studied under stea dy state excitation by using 1-chloronapthalene as a trap. The excitat ion energy capture efficiency by a trap has been obtained as a functio n of the donor concentration at various trap concentrations. Percolati on model has been successfully applied to evaluate the critical expone nts. The evaluated critical exponents are in very good agreement with three dimensional triplet excitation migration topology in poly-methyl methacrylate and two dimensional one in the copolymer.