| 摘要 |
A process is disclosed for producing a hydrolysis resistant rare-earth oxysulfide phosphor which comprises forming a uniform mixture of one or more rare earth oxides, sulfur, alkali carbonate, alkali phosphate, terbium oxide, and a zinc compound wherein the zinc compound is provided in an amount sufficient to result in a zinc concentration of from about 0.05% to about 1.0% by weight, heating the mixture in an air atmosphere in a covered vessel at a temperature of from about 900 DEG C. to about 1400 DEG C. for a sufficient time to form a terbium-activated rare-earth oxysulfide, washing the terbium-activated rare-earth oxysulfide with deionized water to remove essentially all of any water soluble impurities which are present, annealing the washed terbium-activated rare-earth oxysulfide in air at a temperature of from about 525 DEG C. to about 590 DEG C. for about 1 hour to about 3 hours to enhance the brightness of the phosphor. The phosphor has a resistance to hydrolysis that is at least about 35% greater than phosphor produced without the zinc addition.
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