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. 20, 2006
Filed:
Jun. 12, 2001
Michael D. Camras, Sunnyvale, CA (US);
Michael R. Krames, Mountain View, CA (US);
Wayne L. Snyder, Palo Alto, CA (US);
Frank M. Steranka, San Jose, CA (US);
Robert C. Taber, Palo Alto, CA (US);
John J. Uebbing, Palo Alto, CA (US);
Douglas W. Pocius, Sunnyvale, CA (US);
Troy A. Trottier, San Jose, CA (US);
Christopher H. Lowery, Fremont, CA (US);
Gerd O. Mueller, San Jose, CA (US);
Regina B. Mueller-mach, San Jose, CA (US);
Gloria E. Hofler, Sunnyvale, CA (US);
Michael D. Camras, Sunnyvale, CA (US);
Michael R. Krames, Mountain View, CA (US);
Wayne L. Snyder, Palo Alto, CA (US);
Frank M. Steranka, San Jose, CA (US);
Robert C. Taber, Palo Alto, CA (US);
John J. Uebbing, Palo Alto, CA (US);
Douglas W. Pocius, Sunnyvale, CA (US);
Troy A. Trottier, San Jose, CA (US);
Christopher H. Lowery, Fremont, CA (US);
Gerd O. Mueller, San Jose, CA (US);
Regina B. Mueller-Mach, San Jose, CA (US);
Gloria E. Hofler, Sunnyvale, CA (US);
Lumileds Lighting U.S., LLC, San Jose, CA (US);
Abstract
Light emitting devices with improved light extraction efficiency are provided. The light emitting devices have a stack of layers including semiconductor layers comprising an active region. The stack is bonded to a transparent optical element having a refractive index for light emitted by the active region preferably greater than about 1.5, more preferably greater than about 1.8. A method of bonding a transparent optical element (e.g., a lens or an optical concentrator) to a light emitting device comprising an active region includes elevating a temperature of the optical element and the stack and applying a pressure to press the optical element and the light emitting device together. A block of optical element material may be bonded to the light emitting device and then shaped into an optical element. Bonding a high refractive index optical element to a light emitting device improves the light extraction efficiency of the light emitting device by reducing loss due to total internal reflection. Advantageously, this improvement can be achieved without the use of an encapsulant.