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:
Mar. 09, 1999
Filed:
Sep. 24, 1997
Applicant:
Inventor:
Ramon L Yale, Ulster, PA (US);
Assignee:
Osram Sylvania Inc., Danvers, MA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C09K / ;
U.S. Cl.
CPC ...
25230145 ;
Abstract
A terbium-activated rare earth oxysulfide phosphor with an enhanced green:blue emission ratio is disclosed. The phosphor includes a rare earth oxysulfide matrix of the nominal formula M.sub.2-x O.sub.2 S:xTb, where M is lanthanum, gadolinium, yttrium, scandium, lutetium or their mixtures, and x is 0.001-0.2. Up to 1000 ppm of dysprosium is incorporated in the matrix to enhance the green:blue emission ratio of the phosphor. A method of enhancing the green:blue ratio is also disclosed.