Abstract
An oxynitride phosphor (Sr1−xBax)2.97SiO3N4/3:0.03Eu2+ (SBSON) was synthesized by the solid-state reaction at 1550°C for 4h. XRD results show that the major phase of the synthesized phosphors is isostructural with Sr3SiO5 when the content of Ba2+ is not greater than 0.5. Through the doping of Ba2+ 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 Ba2+. The emission peaks can be tuned from 583nm to 601nm by adjusting Ba2+ content. The doping of Ba2+ can also prolong the average lifetime from 1482 to 2122ns. With high emission intensity and thermal stability, this novel oxynitride phosphor SBSON shows potential application in white LEDs.
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