Chromaticity diagram with MSi
:Eu2+phosphors. CIE 1931 chromaticity diagram with the color points of the MSi2O2N2:Eu2+ family members. The white arrow indicates the color shift of the saturated blue Sr0.25Ba0.75Si2O2N2:Eu2+ phosphor to the white due to the yellow emitting impurity phase. Color points of other phosphors from.