Synthesis and Photoluminescence Properties of Dy^{3 +} Doped White-Emitting Phosphor Sr₉La(PO₄)₃(SiO₄)Cl₂:Dy^{3 +}

A series of apatite structure phosphors has been successfully synthesized via the high-temperature solid state method and their phase structure, photoluminescence properties, decay curves as well as PL thermal stability have been investigated in detail. Single phases in such phosphors were verified through X-ray diffraction (XRD) technique. The Sr₉La(PO₄)₃(SiO₄)Cl₂:Dy^{3 +} phosphor could efficiently assimilate then n-UV light from 200 to 500 nm and emit blue (∼485 nm) and yellow light (∼ 580 nm), originating from the f–f transitions of Dy³⁺. Additionally, the luminescence intensity of Sr₉La_0.90(PO₄)₃(SiO₄)Cl₂:0.10Dy^{3 +} at 150 °C was 90% of that at 25 °C, which proved the good thermal stability of the sample. All results indicated that the Sr₉La(PO₄)₃(SiO₄)Cl₂:Dy^{3 +} phosphor has potential application in white LEDs.