The influence of temperature on the migration-accelerated quenching of phosphorescence of naphthalene in glassy toluene

The efficiency of migration-accelerated quenching of triplet excitations of naphthalene by oxygen molecules in an undegassed solution of glassy toluene is investigated as a function of temperature. The temperature dependence of the rate constant of the migration-accelerated quenching is established experimentally, and the activation energy of this process is determined. It is demonstrated that the enhancement of the migration-accelerated quenching with increasing temperature is caused by the reverse migration, i.e., by the increase in the probability of transfer of excitations in the process of their migration to higher energy levels of naphthalene within the limits of the statistical scatter.