| 摘要 |
PROBLEM TO BE SOLVED: To obtain a fluophor emitting red light, high in luminance and excellent in color purity by excitation of ultraviolet ray. SOLUTION: This fluophor is a ultraviolet-exciting fluophor comprising a matrix including boric acid, a trivalent europium (Eu3+) as the emitting component and an alkaline-earth metal and Gd as the other cation components and preferably the composition of the fluophor is represented by the general formulaαRE2O3.βAEO.γB2O3.δEu2O3 (0.05<=α<=0.2, 0.3<=β<=0.5, 0.4<=γ<=0.6, 0.02<=δ<=0.3) wherein Ae is barium or magnesium and RE is gadolinium and yttrium.
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