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:
Oct. 15, 2013
Filed:
Aug. 26, 2011
James Ibbetson, Santa Barbara, CA (US);
Bernd Keller, Santa Barbara, CA (US);
Ronan Letoquin, Fremont, CA (US);
Matthew Donofrio, Raleigh, NC (US);
Michael Bergmann, Chapel Hill, NC (US);
James Ibbetson, Santa Barbara, CA (US);
Bernd Keller, Santa Barbara, CA (US);
Ronan Letoquin, Fremont, CA (US);
Matthew Donofrio, Raleigh, NC (US);
Michael Bergmann, Chapel Hill, NC (US);
Cree, Inc., Durham, NC (US);
Abstract
Methods for fabricating semiconductor devices such as LED chips with emission wavelength correction and devices fabricated using these methods. Different embodiments include sequential coating methods that provide two or more coatings or layers of conversion material over LEDs, which can be done at the wafer level. The methods are particularly applicable to fabricating LED chips that emit a warm white light, which typically requires covering LEDs with one or more wavelength conversion materials such as phosphors. In one embodiment, a base wavelength conversion material is applied to the semiconductor devices. A portion of the base conversion material is removed. At least two different tuning wavelength conversion materials are also applied to the semiconductor devices, either before or after the application of the base conversion material.