Highly Tunable Circularly Polarized Emission of an Aggregation-Induced Emission Dye Using Helical Nano- and Microfilaments as Supramolecular Chiral Templates
Highly Tunable Circularly Polarized Emission of an Aggregation-Induced Emission Dye Using Helical Nano- and Microfilaments as Supramolecular Chiral Templates
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DOI：
10.1021/acsami.2c05012
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发表时间：
2022-06-17
影响因子：
9.5
通讯作者：
Hegmann, Torsten
中科院分区：
文献类型：
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作者：
Liu, Jiao;Molard, Yann;Hegmann, Torsten
基于聚集诱导发射（AIE）的圆偏振发光（CPL）已被认为是开发具有高发光不对称因子（竖线g（lum）竖线）的手光学材料的有前途的途径。在这里，我们提出了一种方法的基础上的超分子自组装方法，利用螺旋纳米或微丝模板结合AIE染料的热可调CPL活性系统的建设。随后的系综的CPL性质主要由各种长丝模板之间的固有几何差异决定，例如它们的总体尺寸（宽度、高度和螺距）和暴露的芳族链段或子层的面积分数。所提出的机制是基于吸收，稳态和时间分辨荧光，绝对量子产率，CPL测量所获得的集体数据。本系列中最有前途的双调制螺旋纳米丝模板的最高垂直条g（lum）垂直条值进一步增强，通过限制在阳极化氧化铝（AAO）纳米通道的适当直径中达到高达垂直条g（lum）垂直条= 0.25。据设想，这种方法将提供新的见解的温度速率指示器或防伪标签的设计使用的组合的结构颜色的纳米和微丝模板和客体染料的AIE属性。
Aggregation-induced emission (AIE)-based circularly polarized luminescence (CPL) has been recognized as a promising pathway for developing chiroptical materials with high luminescence dissymmetry factors (vertical bar g(lum)vertical bar). Here, we propose a method for the construction of a thermally tunable CPL-active system based on a supramolecular self-assembly approach that utilizes helical nano- or microfilament templates in conjunction with an AIE dye. The CPL properties of the ensuing ensembles are predominantly determined by the intrinsic geometric differences among the various filament templates such as their overall dimensions (width, height, and helical pitch) and the area fraction of the exposed aromatic segments or sublayers. The proposed mechanism is based on the collective data acquired by absorption, steady state and time-resolved fluorescence, absolute quantum yield, and CPL measurements. The highest vertical bar g(lum)vertical bar value for the most promising dual-modulated helical nanofilament templates in the present series was further enhanced, reaching up to vertical bar g(lum)vertical bar = 0.25 by confinement in the appropriate diameter of anodized aluminum oxide (AAO) nanochannels. It is envisioned that this methodology will afford new insights into the design of temperature-rate indicators or anti-counterfeiting tags using a combination of structural color by the nano- and microfilament templates and the AIE property of the guest dye.