Magnetic field effects in a polymer-chain-linked donor-acceptor system

Abstract

The magnetic field effect on the intramolecular exciplex luminescence of a polymer-chain-linked pyrene-dimethylaniline system has been studied using both stead-state and time-resolved techniques. The dependence of the exciplex luminescence (φ) and the relative change in the luminescence in the presence of a magnetic field (Δ;∅/∅) on the wavelength λ and dielectric constant (ε) of the medium has been investigated. Although the rise and decay times of this system are quite long compared to the unlinked pyrene-dimethylaniline system, that the ε_max value, at which Δ∅/∅ reaches its maximum, and the β_½ value are nearly the same as these obtained in the unlinked system. The decay curves of the linked system in the absence and in the presence of a field have been rationalized.