Electroluminescent phosphor powders, methods for making phosphor powders, and devices incorporating same
AssigneeCabot Corporation
InventorsMark J. Hampden-Smith, Toivo T. Kodas, James Caruso, Quint H. Powell, Klaus Kunze, Daniel J. Skamser
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Abstract
Electroluminescent phosphor powders and a method for making phosphor powders. The phosphor powders have a small particle size, narrow particle size distribution and are substantially spherical. The method of the invention advantageously permits the economic production of such powders. The invention also relates to improved devices, such as electroluminescent display devices, incorporating the phosphor powders.
Claims15
A powder batch comprising electroluminescent Y2O3 phosphor particles, wherein said particles have a weight average particle size of from about 0.3 μm to about 5 μm and have a substantially spherical morphology, wherein at least about 80 weight percent of said particles are not larger than about two times said average particle size and wherein the level of impurities in said particles is not greater than about 0.1 atomic percent.
A powder batch comprising electroluminescent Y2O3 phosphor particles, wherein said particles have a weight average particle size of from about 0.3 μm to about 5 μm and have a substantially spherical morphology, wherein at least about 80 weight percent of said particles are not larger than about two times said average particle size.
Dependencies are inferred from the claim text.