With manganese more activated green emitting SrAl12O19 phosphor

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A SrAl12O19 green luminescent material is doped with Mn activator ions and at least one trivalent rare earth sensitizer ion species. Preferably, the material contains four rare earth ions : Ce, Pr, Gd and Tb. Optionally, a portion of the aluminum may be substituted with magnesium. The material may be used as a display device or lamp phosphor or as an X-ray diagnostic or laser scintillator.