Abstract: The long afterglow phosphor of Sr2MgSi2O7: Eu2+, Dy3+ was synthesized by high temperature solid state method. Polypropylene luminescent fiber containing this phosphor was prepared by melt spinning method. Micro morphology, phase structure, spectral features and afterglow properties of the luminescent fiber were tested and analyzed. The results show that the fiber has independent superposition phase features of both Sr2MgSi2O7: Eu2+, Dy3+ and polypropylene; the range of its excitation light locates among 250～450nm; it can emit blue light of 460nm wave length; its initial luminescent intensity is more than 600mcd/m2, and afterglow time lasts 7h; the process of afterglow decay consists of fast stage and slow stage.

Key words: luminescent fiber, rare earth luminescent materials, Sr2MgSi2O7, long afterglow