Preparation method and application of organic long-afterglow polyurethane elastic fiber with high quantum yield

The invention provides a preparation method and application of a high-quantum-yield organic long-afterglow polyurethane elastic fiber, and the preparation method comprises the following steps: (1) carrying out reaction on oligomer polyol and excessive diisocyanate to form an NCO-terminated prepolymer solution, and dropwise adding ethylenediamine into the prepolymer solution to carry out chain extension reaction to obtain a polyurethane spinning solution; (2) adding a fluorescent dye into the polyurethane spinning solution prepared in the step (1), and uniformly stirring at room temperature to form a polyurethane-fluorescent dye spinning solution; and (3) carrying out wet spinning on the polyurethane-fluorescent dye spinning solution to prepare the organic long afterglow polyurethane elastic fiber with high quantum yield. According to the invention, the problems of poor flexibility, low quantum yield, short service life, non-uniform luminescence, unstable luminescence and the like of the existing long-afterglo