Method of making electroluminescent phosphors with small...

Details Method of making electroluminescent phosphors with small... Method of making electroluminescent phosphors with small...

C - Chemistry, Metallurgy

09

K

C09K 11/58 (2006.01)

Patent

CA 2532004

An electroluminescent phosphor powder includes copper-activated zinc sulfide particles that have a size distribution with a D50 value of no more than 10 µm, where no more than 25% of the particles have a size greater than about 15µm and/or a 24-hr brightness of at least 15 footlamberts. These particles are made by a method that includes first firing copper-doped zinc sulfide mixed with zinc oxide, sulfur and a chloride- containing flux, rapidly cooling the mixture to below 100°C, and then mulling and second firing the mixture to provide a powder. The powder can then be elutriated to provide the electroluminescent powder with a narrow particle size distribution (more than 90% between about 5 and 15µm). The elutriating step can be avoided (albeit with a slightly wider size distribution) by more tightly controlling the first firing temperature.

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