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<p>To achieve synergistic enhancement of both mechanical and luminescent properties in regenerated cellulose fibers, this study proposes a hierarchical “core–shell-interface” structural strategy. Luminescence stability and mechanical reinforcement were concurrently enhanced through targeted surface modification of the phosphor particles. Specifically, SrAl<sub>2</sub>O<sub>4</sub>:Eu<sup>2+</sup>, Dy<sup>3+</sup> (SAOED) phosphors were coated with a SiO<sub>2</sub> shell through the hydrolysis of Tetraethyl orthosilicate (TEOS) to enhance their environmental stability and luminescent performance. Subsequently, amino-functionalization was carried out using N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane (KH792), which improved interfacial compatibility, particle dispersion, and mechanical strength, thereby achieving a dual-modified functional filler system. The dual-modified SAOED particles were incorporated into a cellulose matrix dissolved in 1-allyl-3-methylimidazolium chloride (AMIMCl), and high-strength luminescent regenerated cellulose fibers were successfully fabricated through a dry–wet spinning process. Systematic characterization techniques, including SEM, FTIR, XRD, and fluorescence spectroscopy, confirmed the successful surface modification and preservation of the crystalline structure of the phosphors, while FTIR and rheological analyses suggested enhanced hydrogen-bonding interactions at the phosphor–cellulose interface. Compared to fibers containing unmodified SAOED, the composite fibers incorporating dual-modified NH<sub>2</sub>@SiO<sub>2</sub>@SAOED particles demonstrated significantly enhanced dispersion, mechanical properties, and fluorescence performance. Notably, the composite fibers at an optimal loading of 8 wt% exhibited a 150% increase in emission intensity, while maintaining a mechanical strength of 2.81 cN/dtex—only 2% lower than that of pure cellulose fibers. This study presents a novel strategy for the development of multifunctional regenerated cellulose fibers, demonstrating their potential applications in dyed textiles and related fields.</p>

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SiO2-coated SrAl2O4: Eu2+, Dy3+ phosphors for luminescent cellulose fibers

  • 期刊论文

  • 发表日期：

    2026年8月4日

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  • Xijie Chen,
  • Jun Song,
  • Jicheng Shan,
  • Kaiyue Jia,
  • Wei Xie,
  • Yuxuan Li,
  • Xiaosheng Qian,
  • Chunzu Cheng,
  • Ting Li

摘要

To achieve synergistic enhancement of both mechanical and luminescent properties in regenerated cellulose fibers, this study proposes a hierarchical “core–shell-interface” structural strategy. Luminescence stability and mechanical reinforcement were concurrently enhanced through targeted surface modification of the phosphor particles. Specifically, SrAl2O4:Eu2+, Dy3+ (SAOED) phosphors were coated with a SiO2 shell through the hydrolysis of Tetraethyl orthosilicate (TEOS) to enhance their environmental stability and luminescent performance. Subsequently, amino-functionalization was carried out using N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane (KH792), which improved interfacial compatibility, particle dispersion, and mechanical strength, thereby achieving a dual-modified functional filler system. The dual-modified SAOED particles were incorporated into a cellulose matrix dissolved in 1-allyl-3-methylimidazolium chloride (AMIMCl), and high-strength luminescent regenerated cellulose fibers were successfully fabricated through a dry–wet spinning process. Systematic characterization techniques, including SEM, FTIR, XRD, and fluorescence spectroscopy, confirmed the successful surface modification and preservation of the crystalline structure of the phosphors, while FTIR and rheological analyses suggested enhanced hydrogen-bonding interactions at the phosphor–cellulose interface. Compared to fibers containing unmodified SAOED, the composite fibers incorporating dual-modified NH2@SiO2@SAOED particles demonstrated significantly enhanced dispersion, mechanical properties, and fluorescence performance. Notably, the composite fibers at an optimal loading of 8 wt% exhibited a 150% increase in emission intensity, while maintaining a mechanical strength of 2.81 cN/dtex—only 2% lower than that of pure cellulose fibers. This study presents a novel strategy for the development of multifunctional regenerated cellulose fibers, demonstrating their potential applications in dyed textiles and related fields.