Luminescence properties of Dy~(3+)-doped single host strontium aluminate phosphorescent phosphor with white-light emission

A single host persistent white-light phosphorescent phosphor,Dy3+-doped Sr3Al2O6,was prepared by high temperature solid state synthesis procedure.Through investigating doping concentration of Dy ion,spectra of excitation and emission and persistent luminescence spectrum,it is confirmed that two emission lines combined to white light are peaked at 484 nm and 578 nm,having a simultaneous decay rate.Herein constituents of white light are ascribed to a same 4f9 energy level of Dy ion with two transitions of 4F9/2→6H15/2 and 4F9/2→6H13/2,resulting in a stable color of white light emission.The depths of trap level derived from measured thermoluminescence(TL) spectra are 0.36 eV and 0.55 eV,corresponding to 348 K and 383 K,respectively,for Sr3Al2O6:Dg3+2 mol% phosphor.The results indicate that Sr3Al2O6:Dy3+ phosphor could be potentially used as a persistent whit-light emitting material.