Single molecule modulation spectroscopy of conjugated polymers.
This paper describes a new single molecule spectroscopy approach for the investigation of triplet-triplet and singlet-triplet interactions in conjugated polymers. The technique involves the irradiation of isolated single, mulitchromophoric, conjugated polymer molecules by a repetitive sequence of variable-intensity microsecond time scale excitation pulses. The fluorescence intensity is synchronously time-averaged for thousands of cycles of the pulse sequence to yield a high signal-to-noise fluorescence transient on the microsecond time scale. The transient can be analyzed with kinetic models to obtain quantitative information about the kinetics of triplet-triplet exciton annihilation and the quenching of singlet excitons by triplet excitons in conjugated polymers.
Gesquiere
Andre J
AJ
Center for Nano- and Molecular Science and Technology and Department of Chemistry and Biochemistry, University of Texas, Austin, Texas 78712, USA.
Lee
Young Jong
YJ
Yu
Ji
J
Barbara
Paul F
PF