Excitation Transfer in Porous Silicas — A Fractal Approach

In this paper, we present both experimental data and a theoretical study of the excited state energy transfer in irregular systems. Picosecond time‐resolved luminescence techniques were employed to resolve the fluorescence curves of both donor and acceptor molecules. By analyzing the kinetics of direct electronic energy transfer, the effective dimensions describing the distributions of adsorbed dye molecules on the surfaces of silica gels and controlled‐pore glasses were obtained. The same dimensions for silica gels were obtained in fluorescence depolarization experiments in one‐component (only donors) systems and in migration‐accelerated trapping (indirect energy transfer) measurements.