Chiroptical nanomaterials with circularly polarized luminescence (CPL) performance have aroused increasing attention. Herein, multicolor CPL-active Janus nanofibers are prepared through a simple parallel electrospinning method using chiral helical polyacetylenes as the chiral source and achiral fluorophores as the fluorescent source. Interestingly, despite a direct spatial isolation between the chiral component and the fluorescent component, blue and green CPL emissions can still be obtained due to the fluorescence-selective absorption behavior of chiral helical polyacetylenes, with a satisfactory dissymmetric factor (g_lum) of 2 × 10^–2 and 2.5 × 10^–3, respectively. Moreover, by taking advantage of the circular polarization fluorescence energy transfer process, red CPL emission is further achieved using the obtained blue and green CPL as energy donors and the achiral red fluorophore as an energy acceptor. The present work offers a facile approach to prepare multilevel-structured chiroptical materials with promising application potentials in a flexible photoelectric device.

中文翻译：

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荧光选择性吸收和圆偏振荧光能量转移有助于手性螺旋聚乙炔 Janus 纳米纤维中多色圆偏振发光的产生


具有圆偏振发光（CPL）性能的手性纳米材料引起了越来越多的关注。在此，使用手性螺旋聚乙炔作为手性源和非手性荧光团作为荧光源，通过简单的平行静电纺丝方法制备了多色CPL活性Janus纳米纤维。有趣的是，尽管手性组分和荧光组分之间存在直接的空间隔离，但由于手性螺旋聚乙炔的荧光选择性吸收行为，仍然可以获得蓝色和绿色CPL发射，并具有令人满意的不对称因子（g _lum 和 2.5 × 10 ^–3 。此外，利用圆偏振荧光能量转移过程，利用获得的蓝色和绿色CPL作为能量供体，非手性红色荧光团作为能量受体，进一步实现了红色CPL发射。目前的工作提供了一种简便的方法来制备多级结构的手性光学材料，在柔性光电器件中具有广阔的应用潜力。