Janus‐Structural AIE Nanofiber with White Light Emission and Stimuli‐Response

White-light emitting elastomers (WLEEs) based on stimuli-responsive aggregation-induced emission (AIE) and regulated Förster resonance energy transfer (FRET) have aroused increasing attention due to the demands for wearable optoelectronic devices. Herein, the blue and orange AIEgens with different environmental sensitivities are synthesized and then encapsulated on both sides of nanofibers via side-by-side electrospinning aiming to achieve the Janus WLEEs. After regulating the blue-orange AIEgens ratio, efficient and stable white light emission with a CIE coordinate of about (0.33, 0.31) is achieved at a blue-orange AIEgens mass ratio of 3:1. Besides, the Janus nanofibers (Janus-NFs) also present super stretchability with elongation at the break over 150% and tensile strength close to 7 MPa. The sensitivity of fluorescence for Janus-NFs to its stretching deformation is used to visualize the evolution of the microstructure of nanofibers during stretching. Moreover, the Janus-NFs are also sensitive to HCl and NH3 , of which the fluorescence color would change under HCl and NH3 fuming above 2 and 57 ppm in air, respectively. The promising applications of the white light Janus-NFs in smart fabrics, warning sensors, and anti-counterfeiting packaging are demonstrated. This finding provides an efficient strategy for achieving wearable WLEEs with multiple functionalities, promoting the development of wearable devices.

基于刺激响应聚集诱导发光（AIE）和调控的Förster共振能量转移（FRET）的白光发射弹性体（WLEEs）由于可穿戴光电器件的需求而受到越来越多的关注。在此，合成了具有不同环境敏感性的蓝色和橙色AIE活性分子，然后通过并列静电纺丝将它们封装在纳米纤维的两侧，旨在获得两面神（Janus）型WLEEs。在调节蓝色 - 橙色AIE活性分子的比例后，当蓝色 - 橙色AIE活性分子的质量比为3:1时，实现了具有约（0.33，0.31）的CIE坐标的高效且稳定的白光发射。此外，两面神纳米纤维（Janus - NFs）还具有超强的拉伸性，断裂伸长率超过150%，拉伸强度接近7 MPa。Janus - NFs的荧光对其拉伸变形的敏感性被用于可视化拉伸过程中纳米纤维微观结构的演变。而且，Janus - NFs对HCl和NH₃也敏感，在空气中HCl和NH₃的浓度分别高于2 ppm和57 ppm时，其荧光颜色会发生变化。展示了白光Janus - NFs在智能织物、警示传感器和防伪包装中的有前景的应用。这一发现为实现具有多种功能的可穿戴WLEEs提供了一种有效的策略，促进了可穿戴设备的发展。