| 摘要 |
PURPOSE:To provide a green luminescent phosphor which exhibits a high luminescent intensity under excitation with mercury bright line emitted from a mercury lamp and is less susceptible to lowering in luminescent intensity during the life of the lamp, which comprises a calcination product having a particular compsn. contg. cerium and terbium as a component. CONSTITUTION:A phosphor having a compsn. of the formula, wherein Ln is Y, La or Gd; A is Mg, Ga, Sr, Ba or Zn; 0.05<=a<=0.90; 0.01<=b<=0.70; a+b<1.0; and 0<=x<1.0. A phosphor having the most excellent properties is one having a compsn. of the above formula, wherein Ln is La; A is Mg; 0.2<=a<=0.5; 0.1<=b<=0.5; a+b<1.0; and 0<=x<1.0. The phosphor can be obtd. by packing an alumina crucible or quartz crucible with a mixture of starting materials, calcining the mixture in a neutral or reducing atmosphere at 800-1,200 deg.C for 3-4hr and treating the calcination product with water or the like.
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