OXY-NITRIDE PYROSILICATE BASED PERSISTENT PHOSPHORS

摘要

A blue (Sr rich) or yellow (Ca rich) persistent phosphor composition is provided, along with methods for making and using the composition. In one embodiment, the phosphor includes a material having a formula of Aa-b-c BdCe(Of-gNg):Eub, REc,, wherein A can be Sr, Ca, Ba, or a combination of these metals; B can be Mg, Zn, Co, or a combination thereof; C can be Si, Ge, or a combination thereof; a is 1 to 2.0; b is 0.0005 to 0.1;c is 0.0005 to 0.1; d is 0.9 to 1; e is 2 to 2.1; f is 6 to 7; g is between 0.001 and 0.1; and RE is Dy, Nd, Er, Ho, Tm, Yb or a combination thereof. Beneficial embodiments use Sr, Mg and Si to produce phosphors that are blue in color or Ca, Mg and Si to produce phosphors that are yellow in color.