Smart textiles with tunable luminescence have received special attention due to their great potential in various advanced photonic applications. Particularly, the development of one-dimensional, on-demand, responsive fluorescence fibers with excellent adaptability is of great significance. Herein, we propose electro-thermochromic fluorescence fibers regulated by a self-crystallinity phase change; that is, their tunable luminescence properties are derived from the reversible conversion of the dispersion state and fluorescence emission of fluorophore molecules during the crystallization/melting processes of phase-change materials. First results obtained with an alginate wet-spinning system demonstrate that the self-crystallinity phase change can produce polymeric fibers with thermochromic fluorescence behavior, which are prepared using microemulsion particles containing a phase-change fatty acid and coumarin fluorescent dyes. These thermochromic fluorescence fibers possess a fast response speed, high emission contrast, and good reversibility (>100 cycles). Particularly, the thermochromic fluorescent fibers can gain an electrotriggered capability by means of electric heating materials, and their great potential in precision operation applications is demonstrated. It is easy to adjust the switching point of the electro-thermochromic fluorescence fibers, highlighting their potential use in a diverse range of applications, the designs of which can be personalized. This work offers a simple yet versatile strategy for constructing electro-thermochromic fluorescence fibers for advanced smart textiles.

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Textile‐substrate electromagnetic interference (EMI) shielding materials show great promise for next‐generation electronic communication technology challenges. A new strategy based on structure optimization is highly desired for wearable electronic devices to improve EMI shielding performance. Here, the enhancement effect of fabric structure on the shielding effectiveness (SE) of conductive nanocomposite coating is demonstrated. Plain fabrics with different fabric densities are weaved and used as the substrate to be layer‐by‐layer assembled by graphite oxide and polypyrrole. The resulting conductive nanocomposite coating endows common cotton fabrics with electrical conductivity and EMI shielding ability. In comparison, the EMI SE of the conductive coated fabrics is depended on the fabric density, that is, the pore size. Specifically, the EMI SE of the coated fabric can be increased by ≈71% through the control of fabric structure. Interestingly, the EMI SE is always the maximum at the fabric density of 100 × 100 picks/ 10 cm, different from the electrical conductivity. Moreover, the sueding treatment was proven to be useful to further improve the EMI SE of the conductive coated fabrics. This work presents the significance of substrate structures in EMI shielding, offering new opportunities for the development of high efficiency EMI shielding fabrics.

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