Synthesis and Photoluminescence Properties of Dy3+ Doped White-Emitting Phosphor Sr9La(PO4)3(SiO4)Cl2:Dy3+

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):Cl-2: Dy3+ phosphor could efficiently assimilate the n-UV light from 200 to 500 nm and emit blue (similar to 485 nm) and yellow light (similar to 580 nm), originating from the f-f transitions of Dy3+. Additionally, the luminescence intensity of Sr9La0.90(PO4)(3)(SiO4)Cl-2: 0.10Dy(3+) at 150 degrees C was 90% of that at 25 degrees C, which proved the good thermal stability of the sample. All results indicated that the Sr9La(PO4)(3)(SiO4)Cl-2: Dy3+ phosphor has potential application in white LEDs.