THEORY OF EXCITON MIGRATION AND FIELD-INDUCED DISSOCIATION IN CONJUGATED POLYMERS

The interplay of migration, recombination, and dissociation of exciton s in disordered media is studied theoretically in the low temperature regime. An exact expression for the photoluminescence spectrum is obta ined. The theory is applied to describe the electric field-induced pho toluminescence-quenching experiments by Kersting et al. [Phys. Rev. Le tt. 73, 1440 (1994)] and Deussen et al. [Synth. Met. 73, 123 (1995)] o n conjugated polymer systems. Good agreement with experiment is obtain ed using an on-chain dissociation mechanism, which implies a separatio n of the electron-hole pair along the polymer chain.