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:
Jun. 07, 2016
Filed:
Feb. 20, 2008
Gerd O. Mueller, San Jose, CA (US);
Regina B. Mueller-mach, San Jose, CA (US);
Michael R. Krames, Los Altos, CA (US);
Peter J. Schmidt, Aachen, DE;
Hans-helmut Bechtel, Aachen, DE;
Joerg Meyer, Aachen, DE;
Jan DE Graaf, Eindhoven, NL;
Theo Arnold Kop, Eindhoven, NL;
Gerd O. Mueller, San Jose, CA (US);
Regina B. Mueller-Mach, San Jose, CA (US);
Michael R. Krames, Los Altos, CA (US);
Peter J. Schmidt, Aachen, DE;
Hans-Helmut Bechtel, Aachen, DE;
Joerg Meyer, Aachen, DE;
Jan de Graaf, Eindhoven, NL;
Theo Arnold Kop, Eindhoven, NL;
Lumileds LLC, San Jose, CA (US);
Abstract
A semiconductor light emitting device comprising a light emitting layer disposed between an n-type region and a p-type region is combined with a ceramic layer which is disposed in a path of light emitted by the light emitting layer. The ceramic layer is composed of or includes a wavelength converting material such as a phosphor. Luminescent ceramic layers according to embodiments of the invention may be more robust and less sensitive to temperature than prior art phosphor layers. In addition, luminescent ceramics may exhibit less scattering and may therefore increase the conversion efficiency over prior art phosphor layers.