Yttrium tantalate phosphors

Details Yttrium tantalate phosphors Yttrium tantalate phosphors

1975-07-16

1977-05-17

Cooper, J.

Compositions

Inorganic luminescent compositions

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

C09K 1108

Patent

active

040240690

ABSTRACT:
Phosphors consisting essentially of a host material having a face-centered cubic crystal structure and the empirical formula YTa.sub.3 O.sub.9 or Y.sub.3 TaO.sub.7 wherein 0.01 to 0.10 mol percent of the Y is replaced with at least one trivalent activator cation. A portion of the Y up to 20 mol percent may also be replaced with at least one trivalent nonactivator cation, such as Gd, La and Lu. The phosphors may be excited with ultraviolet light, x-rays or cathode rays to emit in the visible and ultraviolet regions of the spectrum depending on the excitation and the activator cations present.

REFERENCES:
patent: 3338841 (1967-08-01), Brixner
patent: 3357925 (1967-12-01), Levine et al.
patent: 3586636 (1971-06-01), Kano et al.
patent: 3758486 (1973-09-01), Ropp
Sommerdijk et al., "Chem. Abstracts", vol. 77, 1972, p. 170892z.
Rooksby et al., "J. of the Amer. Ceram. Soc.", vol. 47, No. 2, pp. 94-96.
Lykova et al., "Chem. Abstracts", vol. 71, 1969, p. 34153h.
Blasse et al., "Chem. Abstracts", vol. 77, 1972, p. 145716n.

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