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:
Aug. 21, 2012
Filed:
Feb. 25, 2011
Matthew Donofrio, Raleigh, NC (US);
David B. Slater, Jr., Durham, NC (US);
John A. Edmond, Cary, NC (US);
Hua-shuang Kong, Cary, NC (US);
Matthew Donofrio, Raleigh, NC (US);
David B. Slater, Jr., Durham, NC (US);
John A. Edmond, Cary, NC (US);
Hua-Shuang Kong, Cary, NC (US);
Cree, Inc., Durham, NC (US);
Abstract
A light emitting diode structure is disclosed that includes a light emitting active portion formed of epitaxial layers and carrier substrate supporting the active portion. A bonding metal system that predominates in nickel and tin joins the active portion to the carrier substrate. At least one titanium adhesion layer is between the active portion and the carrier substrate and a platinum barrier layer is between the nickel-tin bonding system and the titanium adhesion layer. The platinum layer has a thickness sufficient to substantially prevent tin in the nickel tin bonding system from migrating into or through the titanium adhesion layer.