Luminescent materials prepared by coating luminescent compositions onto substrate particles
AssigneeE. I. Du Pont de Nemours and Company
InventorsSalvatore A. Bruno, Donald K. Swanson
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Abstract
The present invention relates to a novel cost efficient luminescent composition comprising particles of a core material which have been coated with a luminescent material that is distributed in the form of a chemically homogeneous layer. The average diameter of the core particle is in the range of from about 0.5 to 20 microns, and the coating corresponds to between about 2 and 30 wt % of the total composition. The composition can be employed to form a luminescent film or layer within a plasma display panel.
Claims19
In a flat plasma display panel wherein the improvement comprises a fluorescent film comprising a luminescent powder composition comprising particles with an inert core and at least one luminescent coating on said inert core, the coating comprising about 2 through about 30 weight percent of the powder composition, wherein the core comprises at least one member from the group consisting of barium sulphate, calcium sulphate, magnesium oxide, and calcium fluoride, and the average diameter of the core particles ranges from about 0.5 to about 10 microns.
A paste composition comprising a luminescent powder composition comprising particles with an inert core and at least two successive luminescent coatings on said inert core, the coatings comprising about 2 through about 30 weight percent of the luminescent powder composition, wherein the average diameter of the core particles ranges from about 0.5 to about 10 microns;
- and an amount of an organic vehicle that is effective to disperse said luminescent powder composition wherein the inert core comprises at least one member selected from the group consisting of an alkaline earth sulfate, alkaline earth phosphate, mixed metal oxides, and alkaline earth fluoride.
Dependencies are inferred from the claim text.