Dynamics of triplet excitations of carbonyl compounds in porous matrices

We have studied the phosphorescence of solution of benzaldehyde in porous glasses. The results of the investigations have shown that the introduction of the above-mentioned compound into a porous matrix leads to a change in the spectral-kinetic characteristics of its phosphorescence, due to the interaction of the activator molecules with the walls of the pores. The character of these changes depends on the properties of the solution used and on the type of porous glass. Analysis of the experimental data enabled us to conclude that the porous glasses used in the work contain two types of adsorption centres the interaction with which leads to different changes in the phosphorescence. It is also shown that the interaction of the activator molecules with matrix's walls influences on the energy transport, proceeding in these systems. (C) 1998 Elsevier Science B.V. All rights reserved.