Fibrous materials provide distinct advantages owing to their expansive surface area and enhanced molecular permeability, rendering them highly suitable for diverse applications, including catalysis. Despite the well-established efficiency of lanthanides as catalysts, there is a lack of understanding regarding their integration with fiber-like structures for such purposes. In this study, we present the synthesis and characterization of a Europium (III) complex incorporating a spiropyran derivative as a ligand (m/z 911.8, [Eu(MC)2]3+). This complex is subsequently incorporated into polymer fibers for catalyzing the cleavage of toxic organophosphorus compounds. Fibers were fabricated using both uniaxial (0.22 ± 0.04 μm) and core-sheath (1.34 ± 0.24 μm) systems through electrospinning, with their distinctions highlighted through transmission electron microscopy and solid-state emission analysis. Kinetic studies conducted with core-sheath fibers (containing 3.7 μmol of Eu3+ per gram of fiber) revealed a 100-fold increase in catalytic efficiency compared to spontaneous hydrolysis, with significant improvements compared to previously studied materials composed of Lanthanum (III). While core-sheath fibers exhibited slower hydrolysis kinetics of bis(2,4-dinitrophenyl)phosphate compared to uniaxial fibers, they demonstrated higher turnover frequency rates of 2.1×10–3 mol of substrate converted per minute per mol of Eu (III). Notably, core-sheath fibers exhibited enhanced temporal stability and resistance to complex desorption attributed to the additional polymer coating layer. The findings in this study contribute valuable insights into addressing traditional challenges associated with hybrid materials.