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首页> 外文期刊>RSC Advances >Structure-charge transfer property relationship in self-assembled discotic liquid-crystalline donor-acceptor dyad and triad thin films
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Structure-charge transfer property relationship in self-assembled discotic liquid-crystalline donor-acceptor dyad and triad thin films

机译：自组装盘式液晶供体 - 受体二元和三元薄膜的结构 - 电荷转移性能

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摘要

The photophysical properties of donor-acceptor (D-A) and donor-acceptor-donor (D-A-D) liquid crystalline dyads and triads based on two different discotic mesogens are examined in thin films by steady-state optical spectroscopy and subpicosecond transient absorption measurements. In these systems, triphenylene and perylene bisimide units are covalently linked by flexible decyloxy chain(s) and act as an electron donor (D) and acceptor (A), respectively. These discotic liquid-crystalline systems form well-separated D and A pi-stacked columnar structures in thin films. The absorption spectra of the films indicate an aggregation of the perylene bisimide and triphenylene moieties along the columns. Steady-state photoluminescence measurements show a strong fluorescence quenching that is mainly attributed to a photo-induced charge transfer process taking place between the triphenylene and perylene bisimide units. Subpicosecond transient absorption measurements show that the photoinduced charge transfer (CT) states in the dyad and triad films are formed within 0.3 ps and recombine on a 150-360 ps time scale. In addition, a correlation between the dynamics of the charge recombination process and the spacing distances between D and A units can be established in the dyad and triad films. This study provides important information on the relationship between molecular packing and the charge transfer properties in such self-organized D and A columnar nanostructures.
机译：通过稳态光学光谱分析薄膜在薄膜中检查供体受体（D-A）和供体 - 受体（D-A-D）液晶二元和三合会的供体液晶二元和三合会的光学性性质在薄膜中检查了薄膜和临时瞬态吸收测量。在这些系统中，通过柔性癸氧基链共价连接三苯基和Pernenne Bisimide单元，并分别用作电子给体（D）和受体（A）。这些盘状液晶系统在薄膜中形成分离良好的D和PI堆叠的柱状结构。薄膜的吸收光谱表明沿柱的Per彼此双酰亚胺和三苯基部分的聚集。稳态光致发光测量显示出强烈的荧光猝灭，主要归因于在三苯基和PerneNe Bisimide单元之间进行的光诱导的电荷转移过程。亚磷第二瞬态吸收测量表明，在150-360ps时尺度的0.3 ps和重组中，在二元和三元膜中的光抑制电荷转移（CT）状态在0.3 ps和重组内。另外，可以在Dyad和Triad薄膜中建立电荷重组过程的动态与D和单位之间的间隔距离之间的相关性。该研究提供了关于这种自组织D和柱状纳米结构中分子包装和电荷转移性能之间的关系的重要信息。

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  • 来源
    《RSC Advances》 |2016年第63期|共9页
  • 作者

    Lee Kwang Jin; Woo Jae Heun; Xiao Yiming; Kim Eunsun; Mazur Leszek Mateusz; Kreher David; Attias Andre-Jean; Matczyszyn Katarzyna; Samoc Marek; Heinrich Benoit; Mery Stephane; Fages Frederic; Mager Loic; DAleo Anthony; Wu Jeong Weon; Mathevet Fabrice; Andre Pascal; Ribierre Jean-Charles;

  • 作者单位

    Ewha Womans Univ CNRS Ewha Int Res Ctr Dept Phys Seoul 120750 South Korea;

    Ewha Womans Univ CNRS Ewha Int Res Ctr Dept Phys Seoul 120750 South Korea;

    Univ Paris 06 Univ Paris 04 Inst Parisien Chim Mol CNRS UMR 8232 Chimie Polymeres 4 Pl Jussieu F-75005 Paris France;

    Ewha Womans Univ CNRS Ewha Int Res Ctr Dept Phys Seoul 120750 South Korea;

    Univ Paris 06 Univ Paris 04 Inst Parisien Chim Mol CNRS UMR 8232 Chimie Polymeres 4 Pl Jussieu F-75005 Paris France;

    Univ Paris 06 Univ Paris 04 Inst Parisien Chim Mol CNRS UMR 8232 Chimie Polymeres 4 Pl Jussieu F-75005 Paris France;

    Univ Paris 06 Univ Paris 04 Inst Parisien Chim Mol CNRS UMR 8232 Chimie Polymeres 4 Pl Jussieu F-75005 Paris France;

    Wroclaw Univ Sci &

    Technol Adv Mat Engn &

    Modelling Grp PL-50370 Wroclaw Poland;

    Wroclaw Univ Sci &

    Technol Adv Mat Engn &

    Modelling Grp PL-50370 Wroclaw Poland;

    Univ Strasbourg Inst Phys &

    Chim Mat Strasbourg UMR 7504 CNRS 23 Rue Loess F-67034 Strasbourg France;

    Univ Strasbourg Inst Phys &

    Chim Mat Strasbourg UMR 7504 CNRS 23 Rue Loess F-67034 Strasbourg France;

    Aix Marseille Univ CNRS CINaM UMR 7325 Campus Luminy F-13288 Marseille France;

    Univ Strasbourg Inst Phys &

    Chim Mat Strasbourg UMR 7504 CNRS 23 Rue Loess F-67034 Strasbourg France;

    Aix Marseille Univ CNRS CINaM UMR 7325 Campus Luminy F-13288 Marseille France;

    Ewha Womans Univ CNRS Ewha Int Res Ctr Dept Phys Seoul 120750 South Korea;

    Univ Paris 06 Univ Paris 04 Inst Parisien Chim Mol CNRS UMR 8232 Chimie Polymeres 4 Pl Jussieu F-75005 Paris France;

    Ewha Womans Univ CNRS Ewha Int Res Ctr Dept Phys Seoul 120750 South Korea;

    Ewha Womans Univ CNRS Ewha Int Res Ctr Dept Phys Seoul 120750 South Korea;

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