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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Structure-dependent all-optical switching in graphene-nanoribbon-like molecules: Fully conjugated tri(perylene bisimides)
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Structure-dependent all-optical switching in graphene-nanoribbon-like molecules: Fully conjugated tri(perylene bisimides)

机译：石墨烯-纳米带状分子中依赖于结构的全光交换：完全共轭的三（双酰亚胺

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摘要

We present the structure-dependent nonlinear optical (NLO) properties of fully conjugated tri(perylene bisimides) (triPBIs) toward the understanding of the role of conformational flexibility and π-electron conjugation in molecular NLO properties of model graphene-nanoribbon (GNR)-like molecules. In the present paper, we report the NLO absorption properties of the triPBIs in toluene excited at 532 nm with nanosecond laser pulses, where the observed transient excited state is determined to be a triplet and presented in the nonlinear process similar to the NLO properties that occur in C_(60). As a result, the all-optical switching in both visible and near-infrared regions upon excitation at 532 nm was demonstrated, suggesting that the chemically synthesized model GNRs act well as smart all-optical switching devices without the need of external control. Furthermore, Raman spectral measurement was further used to characterize the conjugated structure properties of model compounds of functionalized graphene nanoribbons (F-GNRs), while the dispersion and splitting of the G-band and D-band in both frequency and intensity can help to distinguish the π-conjugation and conformational flexibility of the two different triPBI isomers, showing the opportunity to tailor their optoelectronic properties by precisely controlling the edge orientation, edge width, and chemical termination of the edges in the synthesized F-GNRs.
机译：我们介绍了完全共轭的三（双酰亚胺（triPBIs）的结构依赖性非线性光学（NLO）性质，以了解构象柔韧性和π电子共轭在模型石墨烯-纳米碳管（GNR）-分子NLO性质中的作用像分子。在本文中，我们报告了triPBI在纳秒激光脉冲下于532 nm激发的甲苯中的NLO吸收特性，其中观察到的瞬态激发态被确定为三重态，并在非线性过程中呈现，类似于发生的NLO特性在C_（60）中。结果，证明了在532 nm激发时可见光和近红外区域中的全光开关，这表明化学合成的模型GNR可以很好地用作智能全光开关设备，而无需外部控制。此外，拉曼光谱测量还用于表征功能化石墨烯纳米带（F-GNRs）模型化合物的共轭结构性质，而G波段和D波段在频率和强度上的分散和分裂可以帮助区分两种不同的triPBI异构体的π共轭和构象柔韧性，显示了通过精确控制合成F-GNR中的边缘取向，边缘宽度和边缘的化学封端来调整其光电性能的机会。

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