Method of forming a high efficiency phosphor for photochromic gl

Details Method of forming a high efficiency phosphor for photochromic gl Method of forming a high efficiency phosphor for photochromic gl

1975-06-02

1976-10-05

Cooper, Jack

Compositions

Inorganic luminescent compositions

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

C09K 1134

Patent

active

039843467

ABSTRACT:
A process for making BaSi.sub.2 O.sub.5 :Pb having a high energy conversion efficiency of ultraviolet emission under electron bombardment. The process includes mixing BaCO.sub.3, BaF.sub.2, Pb(NO.sub.3).sub.2 and SiO.sub.2 in a form having extremely small particle size so as to facilitate complete dispersal of the SiO.sub.2 in the mixture. Pb(NO.sub.3).sub.2, a soluble salt, is mixed with the other ingredients in a slurry of alcohol. The soluble salt dissolves in the alcohol to obtain complete dispersal of lead throughout the mixture. After mixing the other ingredients and before firing, H.sub.3 BO.sub.3 is added. The product BaSi.sub.2 O.sub.5 :Pb is used as a high efficiency phosphor in combination with photochromic glass in an information display system.

REFERENCES:
patent: 3208950 (1965-09-01), Yocom et al.
Gilliland, "Journal of Luminescence," vol. 4, No. 4, 1971, pp. 345-356.
Bril, "The Luminescence of Organic and Inorganic Materials," John Wiley & Sons, 1962, pp. 471-493.

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