Process for the preparation of rare earth oxyhalide phosphor

Details Process for the preparation of rare earth oxyhalide phosphor Process for the preparation of rare earth oxyhalide phosphor

1985-01-14

1986-03-25

Cooper, Jack

Compositions

Inorganic luminescent compositions

Compositions containing halogen; e.g., halides and oxyhalides

C09K 11475

Patent

active

045782113

ABSTRACT:
Rare earth oxyhalide phosphors activated with thulium ion and further incorporating lutetium ion are described exhibiting improved optical resolution for the light image produced therefrom in X-ray image converter devices by reason of the particle size and shape of the phosphor crystals. A multilayer X-ray screen construction utilizing said phosphor material is also described exhibiting improved image sharpness attributable to said phosphor improvement. A preparation method is disclosed wherein the selected oxyhalide is recrystallized in a particular manner to produce phosphor crystals having a more polyhedral shape.

REFERENCES:
patent: Re28592 (1975-10-01), Rabatin et al.
patent: 3607770 (1971-09-01), Rabatin
patent: 3795814 (1974-03-01), Rabatin
patent: 4054798 (1977-10-01), Watanabe et al.
patent: 4315979 (1982-02-01), Brimes et al.
patent: 4478933 (1984-10-01), Rabatin

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