Cation-treated silicate phosphor

Details Cation-treated silicate phosphor Cation-treated silicate phosphor

1999-05-28

2000-11-21

Koslow, C. Melissa

Compositions

Inorganic luminescent compositions

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

2523016R, 313485, 313486, 313635, C09K 1102, C09K 1159, H01J 6100

Patent

active

061498394

ABSTRACT:
A cation-treated silicate phosphor and fluorescent lamp made therefrom are provided wherein the 100 hour radiance maintenance is significantly improved. The cation treatment method involves adding an amount of a silicate phosphor to a salt solution containing a cation wherein the ratio of cation to phosphor in the solution is from about 1:2 to about 4:1 moles of cation to moles of phosphor. The solution is then stirred for a time sufficient to cause the cation to attach to the phosphor surface to form a cation-treated phosphor. The cation-treated phosphor is separated from the solution and annealed at a temperature and for a time sufficient to increase radiance maintenance of the cation-treated phosphor.

REFERENCES:
patent: 5695685 (1997-12-01), Chau

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