Dielectric switching of the nature of excited singlet state in a donor-acceptor-type polyfluorene copolymer

Annamaria Petrozza; Frédéric Laquai; Ian A. Howard; Ji Seon Kim; Richard H. Friend

doi:10.1103/PhysRevB.81.205421

Dielectric switching of the nature of excited singlet state in a donor-acceptor-type polyfluorene copolymer

Annamaria Petrozza, Frédéric Laquai, Ian A. Howard, Ji Seon Kim^*, Richard H. Friend

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

27 Scopus citations

Abstract

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.

Original language	English (US)
Article number	205421
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	81
Issue number	20
DOIs	https://doi.org/10.1103/PhysRevB.81.205421
State	Published - May 12 2010
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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abstract = "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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AU - Kim, Ji Seon

AU - Friend, Richard H.

PY - 2010/5/12

Y1 - 2010/5/12

N2 - 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.

AB - 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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DO - 10.1103/PhysRevB.81.205421

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Dielectric switching of the nature of excited singlet state in a donor-acceptor-type polyfluorene copolymer

Abstract

ASJC Scopus subject areas

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