Photoexcitation spectroscopy of polythiophene

Abstract
Radiative recombination in polythiophene is studied by cw photoluminescence and photoinduced absorption spectroscopies and by photoluminescence-detected magnetic resonance. The fast-recombination centers are assigned to intrachain excitons in defect-free chains, while the slow recombination is due to intrachain excitons bound to spin-(1/2) defects.