The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 19, 2009
Filed:
May. 13, 2004
Gregory A. Marking, Sayre, PA (US);
Chung-nin Chau, Athens, PA (US);
Thomas M. Snyder, Laceyville, PA (US);
Shellie K. Northrop, Sayre, PA (US);
Chen Wen Fan, Sayre, PA (US);
Gregory A. Marking, Sayre, PA (US);
Chung-Nin Chau, Athens, PA (US);
Thomas M. Snyder, Laceyville, PA (US);
Shellie K. Northrop, Sayre, PA (US);
Chen Wen Fan, Sayre, PA (US);
Osram Sylvania Inc., Danvers, MA (US);
Abstract
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<x<0.25 and 0.01<y<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.