Osram Sylvania Inc.

Global Tungsten & Powders Corp.

Judy A Belinski-Wolfe

Thomas A Wolfe

Brian J Payne

Chung Nin Chau

Charles F Chenot

Robert L Stevens

Xianzhong Chen

Chen Wen Fan

Fuquiang Huang

Fuqiang Huang

Michael A Maxwell

A white-emitting electroluminescent lamp is provided that uses a phosphor blend comprising a mixture of particles of an electroluminescent phosphor and particles of an europium-activated alkaline earth phosphor having the general formula SrCaS:Eu where 0&#x2266;x&#x2266;1, wherein the electroluminescent phosphor is selected from a blue-emitting electroluminescent phosphor, a blue-green-emitting electroluminescent phosphor, or a combination thereof. A preferred blend contains from about 5% to about 20% by weight of the europium-activated alkaline earth phosphor.

White-emitting phosphor blend and electroluminescent lamp containing same

A phosphor blend for an electroluminescent lamp is described that comprises a green-emitting electroluminescent phosphor and a red-emitting photoluminescent phosphor, the blend exhibiting an x color coordinate from 0.220 to 0.350 and a y color coordinate from 0.450 to 0.475 when stimulated by an electric field.

Yellow-emitting phosphor blend for electroluminescent lamps

There is presented an electroluminescent phosphor powder of copper-activated zinc sulfide particles that has a size distribution with a D50 value of less than 12 &#x3bc;m, and more preferably less than 10 &#x3bc;m. The powder is preferably made by a method that includes the steps of combining copper-doped zinc sulfide with sulfur, zinc oxide and a chloride-containing flux to form a first mixture; preliminarily firing the first mixture and milling the preliminarily fired first mixture to form a milled material having a D50 value of less than or equal to about 5 &#x3bc;m; blending the milled material with sulfur, zinc oxide and a chloride-containing flux to form a second mixture; firing the mixture in a first firing step at a temperature in a range of about 1020&#xb0; C. to about 1080&#xb0; C. to form a hexagonal zinc sulfide material; inducing defects into the hexagonal zinc sulfide material; firing the hexagonal zinc sulfide material in a second firing step at a temperature in a range of about 650&#xb0; C. to about 850&#xb0; C. to form an electroluminescent phosphor; and sifting the electroluminescent phosphor to provide an electroluminescent phosphor powder comprising phosphor particles that have a size distribution with a D50 value of less than 12 &#x3bc;m. The step of inducing defects may be accomplished by milling, mulling or sonification of the mixture.

Electroluminescent phosphor powder with D50 value of less than 12 &#x3bc;m and method of making

The electroluminescent phosphor of this invention is comprised of zinc sulfide activated with copper and iodine and may produce an emission with an x color coordinate from 0.145 to 0.155 and a y color coordinate from 0.085 to 0.095. The phosphor preferably contains from about 0.08 to about 0.90 weight percent (wt. %) copper.

Electroluminescent phosphor

A method of making zinc sulfide based electroluminescent phosphors is described wherein a first-fired zinc sulfide material having a hexagonal &#x3b2;-ZnS crystal structure is at least partially converted to a distorted hexagonal &#x3b2;-ZnS crystal structure by ultrasonic irradiation. The first-fired material is then fired at a lower temperature to form an electroluminescent phosphor.

Method of making electroluminescent phosphor using sonochemistry

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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Towanda, PA, United States of America

Judy A Belinski-Wolfe