Research on a persistent red tone fluorescent polyacrylonitrile fiber with coaxial structure based on Sr2MgSi2O7:Eu2+, Dy3+ and Y2O2S:Eu3+, Mg2+, Ti4+

Highlights: • A novel red tone fluorescent fiber was obtained by coaxial wet-spinning method. • Phosphor Sr₂MgSi₂O₇ work as a second light source in the fluorescent fiber. • The coaxial fluorescent fiber present better fluorescence performance than traditional fiber. In order to obtain a red fluorescent fiber with long persistent performance, Sr₂MgSi₂O₇:Eu²⁺, Dy³⁺ and Y₂O₂S:Eu³⁺, Mg²⁺, Ti⁴⁺ phosphors were prepared by high-temperature solid-phase method, then the phosphors and Rhodamine B were spun into the Polyacrylonitrile (PAN) through coaxial wet-spinning. The structure and morphology of samples were characterized by the X-ray diffraction, high resolution transmission electron microscopy, X-ray photoelectron spectroscopy, scanning electron microscopy and particle size analyzer. Fluorescent properties were studied based on photoluminescence spectroscopy and afterglow decay curve. The data show that Sr₂MgSi₂O₇ has blue broadband emission due to the electronic transition of Eu²⁺, and the Y₂O₂S has red linear emission spectrum because of the electronic transition of Eu³⁺.The analysis results reveal that the excellent afterglow performance of Sr₂MgSi₂O₇ plays a significant role in the secondary excitation. Rhodamine B was added in the coaxial fiber as a red light compensator through transferring the blue light to red fluorescence.