Preparation of Orange-Red Long Afterglow Phosphors Y2O2S:Sm3+, Mg2+, Ti4+

The orange-red long afterglow phosphors Y2O2S:Sm3+, Mg2+, Ti4+ was prepared by high temperature solid-state method. By XRD analysis, the crystal phase of the sample was Y2O2S, belonging to hexagonal system, and no new crystal phase arose when doping Sm3+, Mg2+, Ti4+. The characteristic peaks of excitation spectrum were located at 373, 388, 417, 430, 475 and 491 nm, and the characteristic peaks of emission spectrum were located at 571, 609 and 657 nm. The content of Sm3+ and doped ions Mg2+, Ti4+ affected the luminescent properties obviously, and Sm3+ affected the luminescent brightness mainly. Mg2+ and Ti4+ could deepen properly trap energy of Y2O2S crystal and strengthen its afterglow properties, the brightness and afterglow properties of sample were better when the mole ratio of Sm/Y, Mg/Y and Ti/Y is 1.4%, 1.25% and 0.9%, respectively.