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Triplet state absorption in carbon nanotubes: A TD-DFT study

机译:碳纳米管中的三重态吸收:TD-DFT研究

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We predict properties of triplet excited states in single-walled carbon nanotubes (CNTs) using a time-dependent density-functional theory (TD-DFT). We show that the lowest triplet state energy in CNTs to be about 0.2-0.3 eV lower than the lowest singlet state energies. Like in pi-conjugated polymers, the lowest CNT triplets are spatially localized. These states show strong optical absorption at about 0.5-0.6 eV to the higher lying delocalized triplet states. These results demonstrate striking similarity of the electronic features between CNTs and pi-conjugated polymers and provide explicit guidelines for spectroscopic detection of CNT triplet states.
机译:我们使用时间依赖的密度泛函理论(TD-DFT)来预测单壁碳纳米管(CNT)中三重激发态的性质。我们显示,CNT中最低的三重态能量比最低的单重态能量低约0.2-0.3 eV。像在pi共轭聚合物中一样,最低的CNT三元组在空间上是局部的。这些状态显示出在较高的离域三重态下约0.5-0.6 eV的强光吸收。这些结果证明了CNT与π共轭聚合物之间电子特征的惊人相似性,并为光谱学检测CNT三重态提供了明确的指导。

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