| 摘要 |
A divalent metal fluorohalide phosphor having a compositional formula: (Ba1-x, MIIx)F2.aBaX2:yEu,zB (wherein, MII is at least one member selected from the group consisting of beryllium, magnesium, calcium, strontium, zinc, and cadmium, X is at least one member selected from the group consisting of chlorine, bromine, and iodine, and a, x, y, and z are numbers satisfying the respective conditions 0.5</=a</= 1.25, 0</=x</=1, 10-6</=y</=2x10-1, and 0<z</=2x10-1), when exposed to and allowed to absorb radiation or ionizing radiation and subsequently excited with a light of 450 to 800 nm of wave length, provides stimulated emission of light with heretofore unattainable high luminance. A radiation image storage panel is produced by depositing on a support a phosphor layer formed of the phosphor of this invention.
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