H - Electricity – 05 – B
Patent
H - Electricity
05
B
H05B 33/14 (2006.01) H05B 33/10 (2006.01)
Patent
CA 2532008
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 12µm, and more preferably less than 10µm. 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 5µm; 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 12µm. The step of inducing defects may be accomplished by milling, mulling or sonification of the mixture.
Belinski-Wolfe Judy A.
Payne Brian J.
Wolfe Thomas A.
Fetherstonhaugh & Co.
Osram Sylvania Inc.
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