Osram Sylvania Inc.

Global Tungsten & Powders Corp.

Xianzhong Chen

Shellie K Northrop

Robert L Stevens

Chen-Wen Fan

Judy A Belinski-Wolfe

Chen Wen Fan

Fuqiang Huang

Michael A Maxwell

An electroluminescent phosphor comprising ZnS:Mn is disclosed. Also disclosed are ZnS:Mn electroluminescent phosphors that are free of or substantially free of copper, and/or wherein the phosphor has a D50 size of less than about 5 &#x3bc;m. In addition, a method for preparing a ZnS:Mn phosphor is disclosed, comprising the steps of contacting at least a portion of each of a first solution comprising a Zncompound, a manganese source, and a second solution comprising a Ssource agent; and then heating the mixture at a temperature and for a time sufficient to form a phosphor.

Electroluminescent ZnS:Mn phosphor and method of making

An electroluminescent phosphor powder includes copper-activated zinc sulfide particles that have a size distribution with a D50 value of no more than 10 &#x3bc;m, where no more than 25% of the particles have a size greater than about 15 &#x3bc;m 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&#xb0; 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 15 &#x3bc;m). The elutriating step can be avoided (albeit with a slightly wider size distribution) by more tightly controlling the first firing temperature.

Method of making electroluminescent phosphors with small particle sizes and powder with D50 value of no more than 10 micrometers

A single-component, yellow-emitting electroluminescent phosphor, a method for making same, and an electroluminescent lamp containing same, are described. The phosphor produces a yellow emission having an x color coordinate from 0.420 to 0.500 and y color coordinate from 0.420 to 0.460 when stimulated by an electric field.

Single-component yellow-emitting electroluminescent phosphor

A single-component white-emitting electroluminescent phosphor and its method of making are described. The single-component phosphor exhibits a white emission having an x color coordinate of 0.23 to 0.41 and a y color coordinate of 0.25 to 0.42. The phosphor is comprised of zinc sulfide activated with copper, manganese, chlorine, and, optionally, one or more metals selected from gold and antimony.

Single-component white-emitting electroluminescent phosphor and method of making same

An orange-yellow-emitting zinc sulfide-based electroluminescent phosphor is described wherein the phosphor has a brightness of greater than 10 foot-Lamberts. More particularly, the phosphor has a brightness of at least about 13 foot-Lamberts and an x color coordinate from about 0.51 to about 0.56 and a y color coordinate from about 0.42 to about 0.48. The zinc sulfide phosphor is activated with manganese, copper, chlorine, and a metal selected from gold and antimony.

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Sayre, PA, United States of America

Xianzhong Chen