Oxygen-containing phosphor powders, methods for making phosphor powders and devices incorporating same
AssigneeCabot Corporation
InventorsMark J. Hampden-Smith, Toivo T. Kodas, James Caruso, Daniel J. Skamser, Quint H. Powell
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Abstract
Phosphor powders and a method for making phosphor powders. The powders are oxygen-containing, such as metal oxides, silicates, borates or titanates and have a small particle size, narrow particle size distribution and are substantially spherical. The method of the invention advantageously permits the continuous production of such powders. The invention also relates to improved devices, such as display devices, incorporating the phosphor powders.
Claims36
A display device for conveying visual graphics and information, comprising:
- a) a plurality of pixel regions comprising phosphor powder layers;
- and
- b) an excitation source adapted to stimulate said phosphor powder to emit light to be viewed by a viewer;
- wherein said phosphor powder comprises oxygen-containing phosphor particles selected from the group consisting of borate particles and aluminate particles that are substantially spherical and have a weight average particle size of not greater than about 5 μm.
A flat panel display, comprising:
- a) an excitation source adapted to stimulate a phosphor;
- and
- b) a viewing panel proximate to said excitation source, comprising a transparent substrate having disposed thereon an oxygen-containing phosphor powder defining pixels, wherein said phosphor powder comprises substantially spherical aluminate particles having a weight average particle size of not greater than about 10 μm.
A field emission display, comprising:
- (a) a back plate portion comprising a plurality of electron tip emitters;
- (b) a transparent front plate portion comprising a layer of phosphor powder comprising oxygen-containing, substantially spherical aluminate phosphor particles, wherein said phosphor particles have a weight average particle size of not greater than about 5 μm.
A method for securing a document, comprising the step of applying a phosphor powder to said document, wherein said phosphor powder comprises oxygen-containing phosphor particles, wherein said phosphor particles are substantially spherical and have a weight average particle size of from about 0.3 μm to about 3 μm and wherein at least about 90 weight percent of said particles are not larger than twice said average particle size.
A plasma display panel, comprising:
- a) a rear panel comprising a plurality of row electrodes;
- b) a front panel comprising a plurality of column electrodes, wherein said row electrodes and said column electrodes are in perpendicular relation to form a plurality of addressable x-y coordinates;
- c) a phosphor powder dispersed on a substrate disposed between said electrodes, wherein said phosphor powder comprises a host material selected from the group consisting of ZnO and aluminates, and comprises particles having a weight average particle size of not greater than about 5 μm and a particle size distribution wherein at least about 90 weight percent of said particles are not larger than twice said average particle size.
Dependencies are inferred from the claim text.