Crystal structure, thermally stability and photoluminescence properties of novel Sr10(PO4)6O:Eu2+ phosphors

• Sr9.97(PO4)6O:0.03Eu2+ phosphor exhibits strong thermal quenching resistance.
• Two different Eu2+ emission centers exists in Sr10(PO4)6O.
• The activation energy was also estimated for the Eu2+ luminescence center.

A series of novel luminescent phosphors Sr10(PO4)6O:Eu2+ with apatite structure were synthesized via a high temperature solid-state reaction. The phase structure, photoluminescence (PL) properties, the PL thermal stability, as well as the fluorescence decay curves of the samples were investigated to characterize the resulting samples, and the selected Sr9.97(PO4)6O:0.03Eu2+ phosphor exhibits strong thermal quenching resistance, retaining the luminance of 88.73% at 150 °C. The quenching concentration of Eu2+ in Sr10(PO4)6O was about 0.03 attributing to the dipole–quadrupole interaction. The Sr10(PO4)6O:Eu2+ phosphor exhibited a broad-band blue emission at 439 nm upon excitation at 346 nm. The results indicate that Sr10(PO4)6O:Eu2+ phosphors have potential applications as near UV-convertible phosphors for white-light UV LEDs.

Sr10(PO4)6O:Eu2+ phosphors have potential applications as near UV-convertible phosphors for white-light UV LEDs.Figure optionsDownload as PowerPoint slide