Journal
PHYSICAL REVIEW B
Volume 81, Issue 20, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.81.205421
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Funding
- Clare College
- Deutsche Forschungsgemeinschaft (DFG)
- Ministry of Education, Science and Technology [R32-10051]
- EPSRC
- Engineering and Physical Sciences Research Council [GR/S99075/01, GR/S99075/02] Funding Source: researchfish
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The spectral evolution of an intrachain neutral singlet exciton toward a charge-transfer (CT) state in solvents of increasing polarity has been monitored by time-resolved photoluminescence and ultrafast transient-absorption spectroscopy in a model conjugated random copolymer composed of electron donor and electron acceptor units. In polar solvents, a charge-like absorption superimposes the region of stimulated emission and leads to a dramatic reduction in gain implying that CT states can be detrimental for light amplification and lasing.
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