TRIPLET EXCITATION TRANSPORT KINETICS IN VAPOR-DEPOSITED NAPHTHALENE

The phosphorescence and delayed fluorescence of vapor-deposited naphthalene films have been studied as functions of time. The decays are analyzed in terms of two distinct domain types: slightly perturbed crystalline domains and highly perturbed domains (domain boundaries). The latter regions exhibit a high degree of energetic disorder and a low-dimensional effective topology. The annihilation kinetics is shown to be "fractal-like", with a time-dependent reaction rate coefficient whose power (h) is found to be on the order of 0.5 (rather than the classical value of 0). Kinetic formulations are given for homofusion, heterofusion, and linear combinations thereof. Analytic expressions are derived for the time dependence of both phosphorescence and delayed fluorescence intensities. © 1990 American Chemical Society.