The thermally stimulated luminescence technique was used for investigating the singlet-triplet splitting of geminate polaron pairs in a ladder-type conjugated polymer. The energy gap that separated the single and triplet states of geminate pairs depended on the polymer morphology and was measured to be in the range of 3-6 meV. THe singlet-triplet branching was strongly impacted by the sample morphology. The low splitting values obtained from quantum-chemical calculations were found to be important for the spin-dependent exciton formation in conjugated polymers.
ASJC Scopus subject areas
- General Physics and Astronomy