Compositions comprising high light-output yellow phosphors...

Details Compositions comprising high light-output yellow phosphors... Compositions comprising high light-output yellow phosphors...

2008-07-15

2008-07-15

Koslow, C. Melissa (Department: 1793)

Compositions

Inorganic luminescent compositions

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

C117S948000, C117S013000, C117S019000

Reexamination Certificate

active

11061979

ABSTRACT:
Embodiments of the present invention are directed to compositions and processing methods of rare-earth vanadate based materials that have high emission efficiency in a wavelength range of 480 to 700 nm with the maximum intensity at 535 nm (bright yellow) under UV, X-ray and other forms of high-energy irradiation. Embodiments of the present invention are directed to general chemical compositions of the form (Gd1-xAx)(V1-yBy)(O4-zCz), where A is selected from the group consisting of Bi, Tl, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Tb, Dy, Ho, Er, Tm, Yb, and Lu for 0<x<0.2; B is Ta, Nb, W, and Mo for 0<y<0.1; and C is N, F, Br, and I for 0<z<0.1. Methods of preparation include sol gel, liquid flux, and co-precipitation processes.

REFERENCES:
patent: 3667901 (1972-06-01), Krylov et al.
patent: 4041319 (1977-08-01), Fukuzawa et al.
patent: 6013199 (2000-01-01), McFarland et al.
patent: 1128512 (1968-09-01), None
Agunaou et al, “Effect of the Gd substitution by Bi in the BixGd1−xVO4 catalysts on the catalytic behaviour of methanol oxidation”, Applied Catalysis A:General, vol. 196, Issue 1, Mar. 27, 2000, pp. 87-92.

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