Compositions – Inorganic luminescent compositions – Sulfur containing
Patent
1989-03-20
1992-03-17
Cooper, Jack
Compositions
Inorganic luminescent compositions
Sulfur containing
C09K 1184
Patent
active
050966146
ABSTRACT:
A process is disclosed for adjusting the green/blue emission ratio in a terbium-activated gadolinium oxysulfide x-ray phosphor, which comprises forming a uniform mixture of gadolinium oxide, sulfur, sodium carbonate, sodium hydrogen phosphate, and terbium oxide, firing the mixture in a closed vessel in an air atmosphere to form the phosphor, washing the phosphor with deionized water to remove essentially all of any water soluble impurities which are present, and deagglomerating and annealing the phosphor in air at a temperature of from about 400.degree. C. to about 600.degree. C. for a sufficient time to form the phosphor. The terbium concentration and firing temperature and firing time are controlled to attain the desired green/blue emission ratio. As the terbium concentration increases, the ratio increases. As the firing temperature and time increase, the ratio decreases.
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patent: 3725704 (1973-04-01), Buchanan et al.
patent: 3868533 (1975-02-01), Schvil
patent: 4507560 (1985-03-01), Mathers et al.
patent: 4624861 (1986-11-01), Yale et al.
patent: 4694217 (1987-09-01), Morita
Karam Ronald E.
Yale Ramon L.
Castle Donald R.
Cooper Jack
GTE Products Corporation
Quatrini L. Rita
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