Compositions – Inorganic luminescent compositions – Compositions containing halogen; e.g. – halides and oxyhalides
Patent
1989-12-19
1991-06-11
Cooper, Jack
Compositions
Inorganic luminescent compositions
Compositions containing halogen; e.g., halides and oxyhalides
C09K 1163
Patent
active
050230158
ABSTRACT:
An improved method for preparing a phosphor is disclosed. The method of the invention includes preparing a solution comprising the non-oxygen elements of the phosphor in molar proportions equal to the respective molar proportions of the non-oxygen elements in the phosphor; precipitating the non-oxygen elements from the solution through the addition of a precipitating agent; spray drying the solution including the precipitate to form a spray dried powder; and firing the spray dried powder in a single firing step. The single firing step of the method comprises (a) increasing the temperature of the spray dried powder at an even and controlled rate from room temperature to a firing temperature sufficiently high to convert the spray dried powder to the phosphor; and (b) maintaining the temperature of the spray dried powder at the firing temperature for a period of time sufficient to produce the phosphor. The method is particularly useful in the preparation of Eu.sup.2+ -activted strontium borate phosphor.
REFERENCES:
patent: 3431215 (1969-03-01), Chenot
patent: 3431216 (1969-03-01), Chenot
patent: 3709826 (1973-01-01), Pitt et al.
patent: 3923682 (1975-12-01), Dale et al.
patent: 4719033 (1988-01-01), Chenot et al.
patent: 4925702 (1990-05-01), Reddy
Torii et al., "Chem. Abstracts", vol. 82, 1975, 37922w.
Cooper Jack
Finnegan Martha A.
GTE Products Corporation
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