Triplet excitation migration for compound molecules in solid solutions

Abstract

Migration of benzaldehyde triplet excitations in solid solution has been studied by the technique of capture by traps using steady-state excitation. The probabilities of excitation capture by a trap have been obtained as a function of the concentration of the indicated compound at various temperatures and trap concentrations. Analysis of the experimental dependencies for scaling in the system “benzaldehyde-1-bromonaphthalene in ethanol” results in values of the critical exponents β=0.41 and γ=1.7 coinciding with the theoretical ones, obtained in the scope of percolation theory for three-dimensional space. The values of the critical exponents and the character of the dependencies are different when toluene or PMMA are used as matrices. We analyze the obtained experimental data within the cluster model of energy migration and the Blumen-Silby model.