Chiral nanostructures and their optical activity have been attracting great interest. Here, we designed an enantiomer bolaamphiphile containing a naphthalene moiety (bola-1) and an alkyl spacer, and investigated its self-assembly as well as optical activity. It was found that the compound could form gels in various organic or mixed organic/water mixtures. In mixed DMSO/water, it formed a nanohelix. Due to the fluorescent nature of the naphthyl group, the nanohelix showed both CD and circularly polarized luminescence (CPL). When three achiral fluorescent molecules, pyrene-1-carboxylic acid (D2), rhodamine 110 (D3) and rhodamine B (D4), were incorporated into the helical structures formed by bola-1, the nanohelix could be retained and the CPL from the dye molecules could be induced. In addition, an energy transfer occurred between the bola-1 nanohelix and the dyes. By mixing the different emission dyes with the bola-1 in an appropriate ratio, white CPL was obtained. It was found that the dissymmetry factor of the white CPL could be increased through energy transfer. This work provided a new convenient and efficient way for obtaining white CPL.

中文翻译：

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自组装的纳米螺旋，通过手性和能量转移实现白色圆偏振发光

手性纳米结构及其光学活性已引起人们极大的兴趣。在这里，我们设计了一个包含萘部分（bola-1）和一个烷基间隔基的对映体bolaamphiphile ，并研究了其自组装以及光学活性。发现该化合物可以在各种有机或混合的有机/水混合物中形成凝胶。在混合的DMSO /水中，它形成了纳米螺旋。由于萘基的荧光性质，纳米螺旋显示出CD和圆偏振发光（CPL）。当三个非手性荧光分子，-1羧酸（D2），若丹明110（D3）和若丹明B（D4）被掺入由bola-1形成的螺旋结构中，可以保留纳米螺旋并诱导染料分子的CPL。此外，在bola-1纳米螺旋和染料之间发生了能量转移。通过将不同的发射染料与bola-1以适当的比例混合，获得了白色CPL。发现通过能量转移可以增加白色CPL的不对称因子。这项工作为获得白色CPL提供了一种新的便捷有效的方法。