Processes of luminescence quenching in study of molecular oxygen diffusionin glassy matrices

The methods have been developed for studying oxygen mobility by donor quenc hing in solutions with uniform concentration and in geminate pairs in a sol id phase. It is shown that the kinetics of luminescence variations with tim e is described by a diffusion model. Oxygen mobility has been studied at lo w temperatures (77 K) in hard polymer matrices, squalane, glasses of low-mo lecular hydrocarbons and alcohols. The methods can be used to measure very low oxygen mobility with a diffusion coefficient of about 10(-23) cm(2) s(- 1). (C) 2000 Elsevier Science B.V. All rights reserved.