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首页> 外文期刊>Chemical Physics Letters >Dynamics of singlet exciton in 1D conjugated polydiacetylene chains: a femtosecond fluorescence study
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Dynamics of singlet exciton in 1D conjugated polydiacetylene chains: a femtosecond fluorescence study

机译:一维共轭聚二乙炔链中单重态激子的动力学:飞秒荧光研究

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摘要

The ~1B_u exciton lifetime has been measured in isolated polydiacetylene chains, using fluorescence up-conversion. It is found to be 130-135 fs at 20 K, and corresponds to the non-radiative internal conversion to a lower-lying excited A_g state, as in polyenes. At low temperature, the absorption linewidth is almost lifetime-limited: inhomogeneous broadening is small (<= 30 cm~(-1)). The lineshape remains Lorentzian up to 150 K, but with a three-fold increase in width, whereas the lifetime is merely constant. The broadening is most probably due to a reduction of the coherence time.
机译:已使用荧光上转换在孤立的聚二乙炔链中测量了〜1B_u激子寿命。发现它在20 K时为130-135 fs,与多烯中的非辐射内部转化为低位激发A_g状态相对应。在低温下,吸收线宽几乎受寿命限制:不均匀加宽很小(<= 30 cm〜(-1))。线形在高达150 K的情况下仍保持Lorentzian,但宽度增加了三倍,而寿命只是恒定的。扩展很可能是由于缩短了相干时间。

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