Unraveling the Contribution of Residual Monomer to the Emission Spectra of Poly(3-hexylthiophene) Aggregates: Implications for Identifying H- and J-type Coupling
Unraveling the Contribution of Residual Monomer to the Emission Spectra of Poly(3-hexylthiophene) Aggregates: Implications for Identifying H- and J-type Coupling
复制标题
揭示残留单体对聚 (3-己基噻吩) 聚集体发射光谱的贡献：对识别 H 型和 J 型耦合的影响
DOI：
10.1021/acs.jpclett.1c01334
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Peteanu, Linda A.
中科院分区：
文献类型：
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作者：
Kramer, Stephanie N.;Brown, Jasper;Rice, Megan;Peteanu, Linda A.
聚（3-己基噻吩）（P3HT）是用于光电器件的半导体聚合物的基准体系。在这些材料中，聚合可以提高电荷传输效率或提高发射产率，这取决于链间的填充。当使用激子耦合模型（如众所周知的Kasha的H-和j -耦合模型）分析吸收和发射光谱时，可以推断出这一点。最近发展的弱耦合h -聚集体（WCH）模型通过电子源强度与第一振动带的强度之比来量化无序程度。在这里，使用基于体和单分子的光谱技术对溶剂中毒形成的P3HT聚集体的基本假设进行了实验测试。具体来说，我们表明残余单体链对聚合谱的贡献必须考虑到，才能正确地将谱分配为H型或j型。引入了一种修正的WCH模型，以考虑多个发射种。
Poly(3-hexylthiophene) (P3HT) is a well-studied benchmark system for semiconducting polymers used in optoelectronic devices. In these materials, aggregation can improve charge transport efficiency or enhance emission yields depending on the interchain packing. This may be inferred from the absorption and emission spectra when analyzed using exciton coupling models such as the well-known H- and J-coupling model of Kasha. The more recently developed weakly coupled H-aggregate (WCH) model quantifies the degree of disorder via the ratio of the electronic origin intensity to that of the first vibronic band. Here, the underlying assumptions of this approach are tested experimentally for P3HT aggregates formed by solvent poisoning using bulk and single-molecule-based spectroscopic techniques. Specifically, we show that the contribution of residual monomeric chains to the aggregate spectrum must be accounted for to properly assign the spectra as H- or J-type. A modification of the WCH model is introduced to account for multiple emissive species.