Enhanced luminescence properties in (Sr sub(1-x)Ba sub(x)) sub(2.97)SiO sub(3)N sub(4/3):0.03Eu super(2+) oxynitride phosphor

An oxynitride phosphor (Sr sub(1-x)Ba sub(x)) sub(2.97)SiO sub(3)N sub(4/3):0.03Eu super(2+) (SBSON) was synthesized by the solid-state reaction at 1550 degree C for 4 h. XRD results show that the major phase of the synthesized phosphors is isostructural with Sr sub(3)SiO sub(5) when the content of Ba super(2+) is not greater than 0.5. Through the doping of Ba super(2+) ions, the particle morphology, luminescence intensities and thermal stability are all improved obviously. When the x equals 0.5 the luminescence intensity reaches maximum which is about 1.48 times as that of the phosphor free of Ba super(2+). The emission peaks can be tuned from 583 nm to 601 nm by adjusting Ba super(2+) content. The doping of Ba super(2+) can also prolong the average lifetime from 1482 to 2122 ns. With high emission intensity and thermal stability, this novel oxynitride phosphor SBSON shows potential application in white LEDs.