Compositions – Inorganic luminescent compositions – Zinc or cadmium containing
Reexamination Certificate
2007-11-06
2007-11-06
Koslow, C. Melissa (Department: 1755)
Compositions
Inorganic luminescent compositions
Zinc or cadmium containing
C313S503000
Reexamination Certificate
active
10907360
ABSTRACT:
There is presented an electroluminescent phosphor powder of copper-activated zinc sulfide particles that has a size distribution with a D50 value of less than 12 μm, and more preferably less than 10 μm. The powder is preferably made by a method that includes the steps of combining copper-doped zinc sulfide with sulfur, zinc oxide and a chloride-containing flux to form a first mixture; preliminarily firing the first mixture and milling the preliminarily fired first mixture to form a milled material having a D50 value of less than or equal to about 5 μm; blending the milled material with sulfur, zinc oxide and a chloride-containing flux to form a second mixture; firing the mixture in a first firing step at a temperature in a range of about 1020° C. to about 1080° C. to form a hexagonal zinc sulfide material; inducing defects into the hexagonal zinc sulfide material; firing the hexagonal zinc sulfide material in a second firing step at a temperature in a range of about 650° C. to about 850° C. to form an electroluminescent phosphor; and sifting the electroluminescent phosphor to provide an electroluminescent phosphor powder comprising phosphor particles that have a size distribution with a D50 value of less than 12 μm. The step of inducing defects may be accomplished by milling, mulling or sonification of the mixture.
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U.S. Appl. No. 10/907,358, filed Mar. 30, 2005 to Chen et al.
Belinski-Wolfe Judy A.
Payne Brian J.
Wolfe Thomas A.
Clark Robert F.
Koslow C. Melissa
Osram Sylvania Inc.
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