title: Generalizing the correlated chromophore domain model of reversible photodegradation to include the effects of an applied electric field.
abstract: All observations of photodegradation and self-healing follow the predictions of the correlated chromophore domain model [Ramini et al., Polym. Chem. 4, 4948 (2013)]. In the present work, we generalize the domain model to describe the effects of an electric field by including induced dipole interactions between molecules in a domain by means of a self-consistent field approach. This electric field correction is added to the statistical mechanical model to calculate the distribution of domains that are central to healing. Also included in the model are the dynamics due to the formation of an irreversibly damaged species, which we propose involves damage to the polymer mediated through energy transfer from a dopant molecule after absorbing a photon. As in previous studies, the model with one-dimensional domains best explains all experimental data of the population as a function of time, temperature, intensity, concentration, and now applied electric field. Though the precise nature of a domain is yet to be determined, the fact that only one-dimensional domain models are consistent with observations suggests that they might be made of correlated dye molecules along polymer chains. Furthermore, the voltage-dependent measurements suggest that the largest polarizability axis of the molecules are oriented perpendicular to the chain.
authors.affiliation: Department of Physics and Astronomy, Washington State University, Pullman, Washington 99164-2814, USA.
authors.forename: Benjamin
authors.initials: B
authors.lastname: Anderson
authors.affiliation: Department of Physics and Astronomy, Washington State University, Pullman, Washington 99164-2814, USA.
authors.forename: Mark G
authors.initials: MG
authors.lastname: Kuzyk