Luminescent fibers are widely used in textile fields because of their excellent luminescence performance. However, the lack of its sensing property limits the fiber’s application. In this work, two rare earth luminescent materials, SrAl₂O₄:Eu²⁺, Dy³⁺ (SAOED) and Sr₂ZnSi₂O₄:Eu²⁺, Dy³⁺ (SZSO), were used as luminous sources, and a yellow thermochromic microcapsule (YTM) was used as a light conversion agent to prepare a thermochromic luminescent fiber (TLF) through wet spinning. The micro-morphology of the TLF was analyzed using scanning electron microscopy (SEM). Three particles were uniformly incorporated in the cellulose fibers, which provide the fibers with a rough surface. Interestingly, the YTM content had no negative effect on the breaking strength of the TLF. Nevertheless, as the concentration of YTM increased from 3 to 10 %, the elongation at break tended to decrease. X-ray diffraction (XRD) results indicate that the cellulose matrix and the wet spinning process did not destroy the phase of rare earth luminescent materials in the fiber. The thermodynamic stability and dynamic phase structure were investigated using thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The TLF was stable below 100 °C. The fluorescence spectra and absorption spectra measurements show that TLF exhibits good thermochromic luminescence performance. The TLF appeared white at room temperature (25 °C) and emitted green light, but when the temperature increased (50 °C), the fiber faded and emitted indigo light. Herein, the potential application areas of the TLF can be used in optical materials and thermal sensors.

Graphic abstract

中文翻译：

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基于黄色热致变色微囊的热致变色发光纤维：制备，性质和潜在应用领域

发光纤维由于其优异的发光性能而被广泛用于纺织领域。但是，缺乏感测性能限制了光纤的应用。在这项工作中，两种稀土发光材料SrAl ₂ O ₄：Eu ₂ ⁺，Dy ³⁺（SAOED）和Sr ₂ ZnSi ₂ O ₄：Eu ₂ ⁺，Dy ³⁺（SZSO）被用作发光源，黄色热致变色微囊（YTM）被用作光转换剂，以通过湿法纺丝制备热致变色发光纤维（TLF）。使用扫描电子显微镜（SEM）分析TLF的微观形态。将三个颗粒均匀地掺入到纤维素纤维中，这为纤维提供了粗糙的表面。有趣的是，YTM含量对TLF的断裂强度没有负面影响。然而，随着YTM的浓度从3％增加到10％，断裂伸长率倾向于降低。X射线衍射（XRD）结果表明，纤维素基体和湿法纺丝过程并未破坏纤维中稀土发光材料的相。使用热重分析（TGA）和差示扫描量热法（DSC）研究了热力学稳定性和动态相结构。TLF在100°C以下稳定。荧光光谱和吸收光谱测量表明，TLF表现出良好的热致变色发光性能。TLF在室温（25°C）下呈现白色，并发出绿光，但是当温度升高（50°C）时，纤维褪色并发出靛蓝光。在此，TLF的潜在应用领域可以用于光学材料和热传感器。TLF在室温（25°C）下呈现白色，并发出绿光，但是当温度升高（50°C）时，纤维褪色并发出靛蓝光。在此，TLF的潜在应用领域可以用于光学材料和热传感器。TLF在室温（25°C）下呈现白色，并发出绿光，但是当温度升高（50°C）时，纤维褪色并发出靛蓝光。在此，TLF的潜在应用领域可以用于光学材料和热传感器。

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