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. 28, 2008
Filed:
Aug. 04, 2004
Jonathan J. Wierer, Jr., Fremont, CA (US);
Mihail M. Sigalas, Santa Clara, CA (US);
Jonathan J. Wierer, Jr., Fremont, CA (US);
Mihail M. Sigalas, Santa Clara, CA (US);
Philips Lumileds Lighting Company, LLC, San Jose, CA (US);
Agilent Technologies, Inc., Palo Alto, CA (US);
Abstract
A semiconductor light emitting device includes a photonic crystal structure that is a lattice of holes in the semiconductor layers. The photonic crystal structure includes multiple lattices. In some embodiments, the device includes a first lattice formed on a first region of the semiconductor layers and a second lattice formed on a second region of the semiconductor layers. The parameters of the first lattice may be selected to maximize the total radiated power from the device. The parameters of the second lattice may be selected to maximize the light extraction into a 30° cone on a surface of the stack.