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首页> 外文期刊>Advanced Functional Materials >Polymorphism and Amplified Spontaneous Emission in a Dicyano-Distyrylbenzene Derivative with Multiple Trifluoromethyl Substituents: Intermolecular Interactions in Play
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Polymorphism and Amplified Spontaneous Emission in a Dicyano-Distyrylbenzene Derivative with Multiple Trifluoromethyl Substituents: Intermolecular Interactions in Play

机译：具有多个三氟甲基取代基的双氰基-二苯乙烯基苯衍生物中的多态性和放大的自发发射：游戏中的分子间相互作用。

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摘要

Intermolecular interactions are decisive in controlling optoelectronic properties of molecular materials. Polymorphism in one and the same material gives a unique opportunity to gain a direct insight into the intermolecular contributions. Here, stimulated emission properties in two polymorphs of a dicyanodistyrylbenzene derivative with multiple trifluoromethyl groups in the terminal rings are investigated, and are correlated to the intermolecular arrangement and resulting excitonic coupling. The polymorphs have distinctly different emission behavior with one emitting in the blue, while the other emits in the green. Only the blue polymorph exhibits light amplification with an apparent threshold of spectral narrowing about 100 mu J cm(-2). The green polymorph fails to exhibit any gain even at two orders of magnitude higher excitation fluence. Pump-probe studies indicate a more extended excited state absorption toward the emission region in the green polymorph compared to the blue, allowing net gain only on a subpicosecond (ps) time scale, too short for the observation of amplified spontaneous emission. This is attributed to intermolecular breathing/shearing modes coupled to the electronic transition due to strong pi-pi overlap in the green polymorph. These observations emphasize the significance of intermolecular interactions in controlling the optical properties as well as light amplification processes in organic conjugated materials.
机译：分子间的相互作用对于控制分子材料的光电性能起决定性作用。同一材料中的多态性提供了一个独特的机会来直接了解分子间的作用。在此，研究了在末端环中具有多个三氟甲基的双氰基二苯乙烯基苯衍生物的两个多晶型物的受激发射性质，并将其与分子间排列和所产生的激子耦合相关。多晶型物具有明显不同的发射行为，一个发射蓝色，而另一个发射绿色。只有蓝色的多晶型物显示出光放大，其光谱的明显阈值缩小了约100μJ cm（-2）。绿色多晶型物甚至在激发通量高两个数量级时也没有表现出任何增益。泵浦探针研究表明，与蓝色相比，绿色多晶型物向发射区的激发态吸收范围更广，仅在亚皮秒（ps）时间范围内具有净增益，对于观察到自发发射来说太短了。这归因于由于绿色多晶型物中强烈的pi-pi重叠而导致的分子间呼吸/剪切模式与电子跃迁耦合。这些观察结果强调了分子间相互作用在控制有机共轭材料中的光学性质以及光放大过程中的重要性。

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  • 来源
    《Advanced Functional Materials》 |2016年第14期|2349-2356|共8页
  • 作者

    Varghese Shinto; Park Sang Kyu; Casado Santiago; Resel Roland; Wannemacher Reinhold; Lueer Larry; Park Soo Young; Gierschner Johannes;

  • 作者单位

    IMDEA Nanosci, Madrid Inst Adv Studies, Ciudad Univ Cantoblanco, Madrid 28049, Spain;

    Seoul Natl Univ, Dept Mat Sci & Engn, Ctr Supramol Optoelectron Mat, Seoul 151744, South Korea;

    IMDEA Nanosci, Madrid Inst Adv Studies, Ciudad Univ Cantoblanco, Madrid 28049, Spain;

    Graz Univ Technol, Inst Solid State Phys, A-8010 Graz, Austria;

    IMDEA Nanosci, Madrid Inst Adv Studies, Ciudad Univ Cantoblanco, Madrid 28049, Spain;

    IMDEA Nanosci, Madrid Inst Adv Studies, Ciudad Univ Cantoblanco, Madrid 28049, Spain;

    Seoul Natl Univ, Dept Mat Sci & Engn, Ctr Supramol Optoelectron Mat, Seoul 151744, South Korea;

    IMDEA Nanosci, Madrid Inst Adv Studies, Ciudad Univ Cantoblanco, Madrid 28049, Spain;

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