Compositions – Inorganic luminescent compositions – Compositions containing halogen; e.g. – halides and oxyhalides
Patent
1974-11-11
1976-10-26
Cooper, Jack
Compositions
Inorganic luminescent compositions
Compositions containing halogen; e.g., halides and oxyhalides
C09K 1146
Patent
active
039882527
ABSTRACT:
Phosphors of the formula Ba.sub.1-x-y-z Sr.sub.x Eu.sub.y R.sub.z FCl when R is one or more of Sm, Dy, Sb, Bi or Zn, x is from 0 to 0.1, y is from 0.0001 to 0.2 and z is from 0 to 0.1 having high efficiency and low lag are made by (1) intimately mixing a substantially stoichiometric mixture of the appropriate metal halides having at least 30% of particles less than 1.5.mu. with the remaining particles having an average particle size less than 3.mu. (2) firing in an atmosphere free of hydrogen at 600.degree. to 950.degree. C for a time sufficient to effect reaction and (3) pulverizing the sintered product. Suitable intimate mixtures of the starting materials can be prepared by (a) prolonged ball milling of the ingredients in the presence of certain organic liquids followed by filtration and drying or (b) slurrying insoluble fluoride powders with an aqueous solution of soluble chloride powders followed by precipitation with an excess of a water miscible organic solvent or (c) freeze-drying a thick aqueous slurry of the ingredients.
REFERENCES:
patent: 2303963 (1942-12-01), Uhle
patent: 3243381 (1966-03-01), Yocom
patent: 3448056 (1969-06-01), Chenot
patent: 3668143 (1972-06-01), Luckey
patent: 3702828 (1972-11-01), Hoffman
Sommerdijk et al. "Chem. Abstracts", vol. 81, 1974, p. 70658s.
Tanguy et al. "Chem. Abstracts", vol. 81, 1974, p. 43625x.
Goldsmith et al. "Tech Report AFML-TR-65-115", 1965 pp. 10-12.
Cooper Jack
E. I. Du Pont de Nemours and Company
LandOfFree
Process for the production of Ba(Sr)FCl:Eu phosphors does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for the production of Ba(Sr)FCl:Eu phosphors, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the production of Ba(Sr)FCl:Eu phosphors will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-183445