Radiant energy – Invisible radiation responsive nonelectric signalling – Luminescent device
Patent
1983-09-02
1985-01-29
Anderson, Bruce C.
Radiant energy
Invisible radiation responsive nonelectric signalling
Luminescent device
2523014H, 2523014F, 423463, G21K 400, C09K 1124, C09K 1112
Patent
active
044968442
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, Te and Sn; and X is selected from Cl and Br. In one form the phosphor has a purity with respect to naturally-occurring 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:
C. D. Flint et al., "Infrared Luminescence Spectra of Hexachloroiridate (IV) and Hexabromoiridate (IV) in Cubic Crystals," Inorg. Chem., vol. 20 (1981), pp. 1768-1771.
C. D. Flint et al., "High Resolution Infrared and Visible Luminescence Spectra of OsCl.sub.6.sup.2- and OsBr.sub.6.sup.2- in Cubic Crystals," Molecular Physics, vol. 41, No. 4 (1980), pp. 907-923.
B. A. Kozikowski et al., "Intraconfigurational Absorption and Magnetic Circular Dischroism Spectra of Os.sup.4 in Cs.sub.2 ZrCl.sub.6 and in Cs.sub.2 ZrBr.sub.6," Molecular Physics, vol. 40, No. 2 (1980), pp. 477-490.
A. R. Reinberg et al., "Sharp-Line Luminescence of Re.sup.4+ in Cubic Single Crystals of Cs.sub.2 ZrCl.sub.6 and Cs.sub.2 HfCl.sub.6," Physical Review B, vol. 1, No. 5 (Mar. 1, 1970), pp. 2085-2088.
H. H. Patterson et al., "Optical Spectra of Ru.sup.4+ in Single Crystals of K.sub.2 PtCl.sub.6 and Cs.sub.2 ZrCl.sub.6 at 4.2.degree. K.," The Journal of Chemical Physics, vol. 52, No. 2, Jan. 15, 1970, pp. 849-856.
Anderson Bruce C.
Berman Jack I.
Bruzga Charles E.
Davis Jr. James C.
General Electric Company
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