Compositions – Inorganic luminescent compositions – Compositions containing halogen; e.g. – halides and oxyhalides
Patent
1976-02-11
1977-06-28
Cooper, Jack
Compositions
Inorganic luminescent compositions
Compositions containing halogen; e.g., halides and oxyhalides
C09K 1146
Patent
active
040324710
ABSTRACT:
Phosphors which have a host matrix of yttrium oxide or a rare earth metal oxide and are activated by one or more rare earth metal activators are prepared by heating a mixture of salts of the host and activator metals (preferably this mixture is formed by co-precipitating the salts of the host and activator metals) at an elevated temperature in an oxygen-containing atmosphere to form the oxide phosphor, and subsequently heating the phosphor at an elevated temperature in a non-oxidizing atmosphere, which is free of halogenating agents, chalcogenating agents, or fluxes. The step of heating in a non-oxidizing atmosphere brings about a substantial increase in the X-ray speed of the phosphor, improves the stability of the phosphor to light, and increases the reflectance of the phosphor in the visible region of the spectrum. Phosphors prepared by use of this process are useful in the manufacture of X-ray intensifying screens.
REFERENCES:
patent: 3449258 (1969-06-01), Ropp et al.
patent: 3484381 (1969-12-01), Yale et al.
patent: 3574130 (1971-04-01), Mathers et al.
patent: 3682823 (1972-08-01), Hitomi et al.
patent: 3723339 (1973-03-01), Wanmaker et al.
Cooper Jack
Eastman Kodak Company
Ruch J. J.
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