Intermolecular interaction effects on the ultrafast depolarization of the optical emission from conjugated polymers
Intermolecular interaction effects on the ultrafast depolarization of the optical emission from conjugated polymers
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DOI：
10.1103/physrevlett.98.027402
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发表时间：
2007-01-12
影响因子：
8.6
通讯作者：
Herz, L. M.
中科院分区：
文献类型：
--
作者：
Chang, M. H.;Frampton, M. J.;Herz, L. M.
我们研究了链间相互作用对共轭聚合物固体薄膜光致发光超快退偏的影响。通过将共轭链与绝缘大环或与惰性主体聚合物络合来实现对链间分离的精确控制。我们的测量表明，激发到链状聚集体的较高电子态之后，伴随着跃迁偶极矩的旋转，紧接着是快速(<；100fs)到较低激发态的驰豫。这些发现强调了考虑一条以上聚合链的初始激子离域的必要性。
We have investigated the effect of interchain interactions on the ultrafast depolarization of the photoluminescence from solid films of a conjugated polymer. Accurate control was exercised over the interchain separation by threading of the conjugated chains with insulating macrocycles or complexation with an inert host polymer. Our measurements indicate that excitation into the higher electronic states of a chain aggregate is followed by a fast (< 100 fs) relaxation into lower excited states with an associated rotation of the transition dipole moment. These findings emphasize the need for consideration of initial excitonic delocalization across more than one polymeric chain.