Compositions – Inorganic luminescent compositions – Compositions containing halogen; e.g. – halides and oxyhalides
Patent
1989-06-06
1991-08-13
Cooper, Jack
Compositions
Inorganic luminescent compositions
Compositions containing halogen; e.g., halides and oxyhalides
2523014F, C09K 1161, C09K 1167
Patent
active
050394487
ABSTRACT:
An X-ray imaging system includes a phosphor that exhibits a fast-acting photoluminescent response both in luminescing upon X-ray stimulation and ceasing to luminesce upon cessation of X-ray stimulation. The phosphor has the general formula A.sub.2 MX.sub.6 wherein A is selected from Cs, Rb, Na and K; M is selected from Ti, Zr, Hf and Te; and X is selected from Cl and Br. In one form the phosphor has a purity with respect to naturally-occuring impurities of at least about 98.0 percent (by weight) and is sufficiently deficient of luminescent activators effective only at very low temperatures that the phosphor luminesces at higher temperatures.
REFERENCES:
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Cooper Jack
Davis Jr. James C.
General Electric Company
Snyder Marvin
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