A phosphor comprises europium, at least two alkaline-earth metals, and at least a Group-13 metal. In one embodiment, the phosphor has a formula selected from the group consisting of Sr.sub.4-a-zA.sub.aEu.sub.zD.sub.12O.sub.22 and Sr.sub.4-a-zA.sub.aEu.sub.zD.sub.14O.sub.25; wherein A is at least an alkaline-earth metal other than strontium; D is an element selected from the group consisting of Group-13 metals, group-3 metals, and rare-earth metals; 00. The phosphor can be used in light sources and displays.

 
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