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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Excited-state dynamics of polyfluorene derivatives in solution
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Excited-state dynamics of polyfluorene derivatives in solution

机译：溶液中聚芴衍生物的激发态动力学

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摘要

The excited-state dynamics of two polyfluorene copolymers, one fully conjugated containing phenylene vinylene units alternated with 9,9'-dihexylfluorenyl groups and the other segmented by -(CH2)(8)- spacer, were studied in dilute solution of different solvents using a picosecond single-photon timing technique. The excited-state dynamics of the segmented copolymer follows the Forster resonant energy-transfer model which describes intrachain energy-transfer kinetics among random oriented chromophores. Energy transfer is confirmed by analysis of fluorescence anisotropy relaxation with the measurement of a short decay component of about 60 ps. The fluorescence decay surface of the fully conjugated copolymer is biexponential with decay times of about 470 and 900 ps, ascribed to deactivation of chain moieties containing trans and cis isomers already in a photostationary condition. Thus, energy transfer is very fast due to the conjugated nature and rigid-rod-like structure of this copolymer chain.
机译：在不同溶剂的稀溶液中，研究了两种聚芴共聚物的激发态动力学，其中一种是完全共轭的含苯撑亚乙烯基单元与9,9'-二己基芴基交替排列，另一种被-（CH2）（8）-间隔基分段了皮秒单光子定时技术。链段共聚物的激发态动力学遵循Forster共振能量转移模型，该模型描述了随机取向发色团之间的链内能量转移动力学。通过分析荧光各向异性弛豫并测量约60 ps的短衰减成分，证实了能量转移。完全共轭共聚物的荧光衰减表面是双指数的，衰减时间分别约为470和900 ps，这归因于已经处于光平稳状态的含有反式和顺式异构体的链部分的失活。因此，由于该共聚物链的共轭性质和刚性杆状结构，能量传递非常快。

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