Gesquiere Andre J, Lee Young Jong, Yu Ji, Barbara Paul F
Center for Nano- and Molecular Science and Technology and Department of Chemistry and Biochemistry, University of Texas, Austin, Texas 78712, USA.
J Phys Chem B. 2005 Jun 30;109(25):12366-71. doi: 10.1021/jp0507851.
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.
本文描述了一种用于研究共轭聚合物中三重态-三重态和单重态-三重态相互作用的新型单分子光谱方法。该技术包括用可变强度微秒时间尺度激发脉冲的重复序列照射孤立的单个、多发色团共轭聚合物分子。对脉冲序列的数千个周期进行荧光强度同步时间平均，以在微秒时间尺度上产生高信噪比的荧光瞬态。可以用动力学模型分析该瞬态，以获得关于共轭聚合物中三重态-三重态激子湮灭动力学以及三重态激子对单重态激子猝灭的定量信息。
