A series of blue long afterglow mixed halide-phosphate phosphors Sr5 (PO4)3 FxCl1-x:Eu2+,Gd3+were synthesized in air by traditional solid-state reaction route. The crystal structures, photoluminescence, thermoluminescence properties and afterglow proper-ties of the phosphors were characterized systematically using X-ray diffraction (XRD), luminescence spectrophotometer, microcom-puter thermoluminescence dosimeter and single photon counter, respectively. Under 280 nm excitation, the broadband emissions of Eu2+ions were observed at 445 nm (blue) due to the 4f7→4f65d transition. It was demonstrated that there existed the self-reduction of the Eu3+to Eu2+ions in this special halide-phosphate matrix in air condition. The addition of Gd3+ions obviously enhanced the after-glow properties of the single doped Eu2+ions in the halide-phosphate phosphors. And the content of the fluoride anions also had sig-nificant influence on the afterglow properties. All results indicated that Sr5 (PO4)3 FxCl1-x:Eu2+,Gd3+might be potential phosphors for long lasting phosphorescence (LLP) materials.
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