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Photophysics of Single-walled Carbon Nanotubes and Thin-film Conjugated Polymers Within π-electron Model

机译:π电子模型中单壁碳纳米管和薄膜共轭聚合物的光物理

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摘要

Electron-electron interaction effects play important role in the photophysics of complex organic materials such as π-conjugated polymers and single-walled carbon nanotubes. Our theoretical work within a π-electron model captures the essential mechanism of the photophysics in these apparently different π-conjugated systems. In both polymer and nanotube systems, we not only explain existing experiments but also make testable predictions. In the area of π-conjugated polymers, we develop a theory of the electronic structure and photophysics of interacting chains to understand the differences between solutions and films. While photoexcitation generates only the optical exciton in solutions, the optical exciton as well as weakly allowed excimers are generated in films. Photoinduced absorption in films is primarily from the lowest excimer. We are also able to explain peculiarities associated with photoluminescence, including delayed photoluminescence and its quenching by electric field. We thereby resolve controversies in the field that are more than a decade old. In the area of single-walled carbon nanotubes, we have investigated the exciton theory of the electronic structure of both semiconducting and metallic nanotubes. We are able to determine quantitatively the exciton energies and exciton binding energies of the nanotubes, in both longitudinal and transverse directions. Our estimate of longitudinal exciton energies and exciton binding energies of semiconducting tubes are the best quantitative fits to the experimental results to date. We also make predictions that the longitudinal exciton binding energies of metallic tubes are comparable to those of semiconducting tubes, in contradiction to recently published results. Our work demonstrates a universality in the photophysics of S-SWCNTs and PCPs that arises from their common quasi-one-dimensionality and π-conjugation.
机译:电子-电子相互作用效应在复杂的有机材料(例如π共轭聚合物和单壁碳纳米管)的光物理中起着重要作用。我们在π电子模型中的理论工作抓住了这些明显不同的π共轭系统中光物理的基本机理。在聚合物和纳米管系统中,我们不仅解释现有的实验,而且做出可检验的预测。在π共轭聚合物领域,我们发展了相互作用链的电子结构和光物理的理论,以了解溶液和薄膜之间的差异。尽管光激发仅在溶液中产生光学激子,但在薄膜中却产生了光学激子和弱容许激子。薄膜中的光诱导吸收主要来自最低的准分子。我们还能够解释与光致发光有关的特性,包括延迟的光致发光及其通过电场的猝灭。因此,我们解决了该领域中已有十多年历史的争议。在单壁碳纳米管领域,我们研究了半导体纳米管和金属纳米管的电子结构的激子理论。我们能够定量地确定纳米管在纵向和横向上的激子能和激子结合能。我们对半导体管的纵向激子能量和激子结合能的估计是迄今为止对实验结果的最佳定量拟合。我们还预测,与最近发表的结果相反,金属管的纵向激子结合能与半导体管的相当。我们的工作证明了S-SWCNT和PCP在光物理中的普遍性是由于它们共同的准一维性和π共轭而产生的。

著录项

  • 作者

    Wang Zhendong;

  • 作者单位
  • 年度 2008
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  • 原文格式 PDF
  • 正文语种 EN
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