Compositions – Inorganic luminescent compositions – Compositions containing halogen; e.g. – halides and oxyhalides
Patent
1976-12-01
1977-11-08
Cooper, Jack
Compositions
Inorganic luminescent compositions
Compositions containing halogen; e.g., halides and oxyhalides
C09K 1146
Patent
active
040575080
ABSTRACT:
In europium-activated alkaline earth mixed halide x-ray phosphor compositions the addition of minor amounts of yttrium significantly reduces afterglow or persistance. A syngeristic effect upon the reduction of afterglow is observed when both yttrium and lithium additives are both included. Additions of other rare earths and alkali metals are not effective to reduce afterglow. The effective amount of Y is from about 0.001 to about 0.1 moles of yttrium per mole of host. When lithium is used in conjunction with yttrium, about 0.001 to about 0.1 moles of lithium per mole of host is used.
REFERENCES:
patent: 2303917 (1942-12-01), Dietz
patent: 2303963 (1942-12-01), Uhle
patent: 2409174 (1946-10-01), Dietz
patent: 3163610 (1964-12-01), Yocom
patent: 3951848 (1976-04-01), Wolfe et al.
patent: 3988252 (1976-10-01), Ferretti
Tangvy et al., "Material Research Bull.", vol. 9, pp. 831-836, 1974.
Philips, "Chemical Abstracts", vol. 80, 1974.
Messier Russell Francis
Wolfe Robert Wade
Castle Donald R.
Cooper Jack
Fox John C.
GTE Sylvania Incorporated
O'Malley Norman J.
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