ABSTRACT
Correct description of the kinetics of processes involving electron-excited molecules is a topical task in view of the development of molecular electronics and photonics. In particular, it is possible to probe nanostructures using the reaction of cross-annihilation of electron excitations localized on oxygen molecules and immobile luminophor molecules, which is accompanied by delayed fluorescence [1-3]. As a result of the interaction between an oxygen molecule and immobile luminophor occurring in an excited triplet state, the О2 molecule passes to an excited singlet state while the luminophor molecule is inactivated. Then, the singlet oxygen molecule can interact with the still unquenched triplet center, which results in its passage into the first excited singlet state that is fluorogenic. The kinetics of this reaction in porous matrices is significantly influenced by the character of mobile reactant motions in a potential field of the pore walls. Namely, the lateral diffusion of oxygen molecules can be interrupted by their desorption’s into the gas phase within the pore volume. For this reason, in the course of processing of a time-resolved luminescence signal for extracting information on the system parameters, it is necessary to use mathematical models that take into account peculiarities of the migration of oxygen molecules.
