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:
Sep. 20, 2005
Filed:
Aug. 31, 2000
Daniel A. Steigerwald, Cupertino, CA (US);
Michael J. Ludowise, San Jose, CA (US);
Steven A. Maranowski, San Jose, CA (US);
Serge L. Rudaz, Sunnyvale, CA (US);
Jerome C. Bhat, San Jose, CA (US);
Daniel A. Steigerwald, Cupertino, CA (US);
Michael J. Ludowise, San Jose, CA (US);
Steven A. Maranowski, San Jose, CA (US);
Serge L. Rudaz, Sunnyvale, CA (US);
Jerome C. Bhat, San Jose, CA (US);
Lumileds Lighting U.S., LLC, San Jose, CA (US);
Abstract
Silver electrode metallization in light emitting devices is subject to electrochemical migration in the presence of moisture and an electric field. Electrochemical migration of the silver metallization to the pn junction of the device results in an alternate shunt path across the junction, which degrades efficiency of the device. In accordance with a form of this invention, a migration barrier is provided for preventing migration of metal from at least one of the electrodes onto the surface of the semiconductor layer with which the electrode is in contact.