Osram Sylvania Inc.

Chen Wen Fan

Arunava Dutta

Gregory A Marking

Leonard V Dullea

Thomas M Snyder

Shellie K Northrop

Robert L Stevens

Judy A Belinski-Wolfe

Xianzhong Chen

Chung-nin Chau

Fuqiang Huang

Michael A Maxwell

Nicolas Desbiens

Blue-emitting phosphors for use with plasma display panels (PDP) or other vacuum ultraviolet-excited (VUV) devices are provided. These blue-emitting phosphors and mixtures thereof include at least a europium-activated calcium-substituted barium hexa-aluminate (CBAL) phosphor. Preferably, the CBAL phosphor has a composition which may be represented by the formula: BaCaEuAlO, wherein 0&#x3c;x&#x3c;0.25 and 0.01&#x3c;y&#x3c;0.20. These blue-emitting phosphors exhibit improved degradation characteristics, including reduced color shift and increased intensity maintenance, under conditions found in VUV-excited devices.

VUV-excited device with blue-emitting phosphor

The sensitivity of YPO:Ce phosphors to 185 nm radiation may be increased by incorporating a praseodymium coactivator. The use of Ce and Pr as co-activators in a YPOphosphor improves the sensitivity of the phosphor to excitation by both 185 nm and 254 nm radiation and should increase total UVA and UVB output in fluorescent lamps. The co-activated phosphor has emission peaks at about 355 nm and about 335 nm.

Ce,Pr-coactivated yttrium phosphate phosphor and lamp containing 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.

High brightness orange-yellow-emitting electroluminescent phosphor and method of making

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Sayre, PA, United States of America

Chen Wen Fan