NUMERICAL TREATMENT OF THE KINETICS OF LUMINESCENCE QUENCHING IN SOLIDS

We study the problem of determining the electron transfer parameters f rom the kinetics of luminescence quenching in solids. The region of qu encher concentration is estimated in which the approximation of binary interactions (ABI) may be employed for data processing. It is shown t hat the obtained transfer parameters may be erroneous even though the data fitting error is less than the experimental one. Calculations of the luminescence kinetics employing direct modeling of the multi-parti cle donor-acceptor clusters are performed. It is shown on the basis of these calculations that the ABI for data processing gives a concentra tion dependence of the transfer parameters at high concentrations of q uenchers. These apparent dependences are like real ones which may appe ar due to modification of the medium's energy level structure with gro wth of the quencher concentration. It is also shown that these apparen t dependences are senstive to the spatial structure of medium.