Effect of BaF2 on crystal structure and luminescent properties of Sr2SiO4:Eu2+ for light emitting diode lighting.

Divalent europium-activated strontium silicate (Sr2SiO4:Eu2+) phosphors were prepared at relatively low temperature via a conventional solid-state reaction method, in which BaF2 was used as both flux and component. The effect of BaF2 on XRD patterns and luminescent properties of Sr2SiO4:Eu2+ was investigated. BaF2 could enhance the emission intensity and change the wavelength of emission peaks. These phosphors showed yellow to green emission bands with the amounts of BaF2. With a combination of blue LED chip, these phosphors are still more efficient in the amount used than commercial phosphors when they are doped on the chips, indicating that they may become promising phosphor candidates for white LEDs.