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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Intramolecular Exciton Relaxation and Migration Dynamics in Poly(3-hexylthiophene)
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Intramolecular Exciton Relaxation and Migration Dynamics in Poly(3-hexylthiophene)

机译：聚（3-己基噻吩）的分子内激子弛豫和迁移动力学

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摘要

Exciton dynamics are investigated for size selected poly(3-hexylthiophene) samples in dilute chloroform solutions using time-resolved fluorescence. The sizes range from an average of 39 monomers (M_w = 6490 Da) to an average of 168 monomers (M_w = 27860 Da). Both isotropic emission transients, which monitor downhill energy migration, and time-resolved emission depolarization, used to measure orientational migration of the excitons, are reported as a function of emission energy. Downhill energy migration accelerates significantly as the chains become longer. While amplitude of the initial (sub-100 fs) depolarization increases with chain length, the subsequent rate of exciton reorientation is relatively insensitive to chain length for times less than 30 ps and then slows as the chains become longer. The chain length dependence provides additional insight into the connection between spectral diffusion and exciton spatial migration. The results are considered in terms of the distribution of accessible exciton states and how this distribution changes with chain length.
机译：使用时间分辨荧光，研究了稀氯仿溶液中大小选定的聚（3-己基噻吩）样品的激子动力学。大小范围从平均39个单体（M_w = 6490 Da）到平均168个单体（M_w = 27860 Da）。监测下坡能量迁移的各向同性发射瞬变和用于测量激子定向迁移的时间分辨发射去极化均被报告为发射能量的函数。随着链条的延长，下坡能量的迁移显着加速。初始（低于100 fs）去极化的幅度随链长的增加而增加，随后的激子重取向速率对链长的敏感度小于30 ps，然后随着链长的增加而减慢。链长相关性提供了对光谱扩散与激子空间迁移之间联系的更多了解。根据可访问激子状态的分布以及此分布如何随链长变化而考虑结果。

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