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:
Sep. 17, 2013
Filed:
Mar. 29, 2012
Aurelien Jean Francois David, San Francisco, CA (US);
Rafael I. Aldaz, Pleasanton, CA (US);
Mark Melvin Butterworth, Santa Clara, CA (US);
Serge J. A. Bierhuizen, San Jose, CA (US);
Aurelien Jean Francois David, San Francisco, CA (US);
Rafael I. Aldaz, Pleasanton, CA (US);
Mark Melvin Butterworth, Santa Clara, CA (US);
Serge J. A. Bierhuizen, San Jose, CA (US);
Koninklijke Philips N.V., Eindhoven, NL;
Abstract
A light emitting device comprises a flip-chip light emitting diode (LED) die mounted on a submount. The top surface of the submount has a reflective layer. Over the LED die is molded a hemispherical first transparent layer. A low index of refraction layer is then provided over the first transparent layer to provide TIR of phosphor light. A hemispherical phosphor layer is then provided over the low index layer. A lens is then molded over the phosphor layer. The reflection achieved by the reflective submount layer, combined with the TIR at the interface of the high index phosphor layer and the underlying low index layer, greatly improves the efficiency of the lamp. Other material may be used. The low index layer may be an air gap or a molded layer. Instead of a low index layer, a distributed Bragg reflector may be sputtered over the first transparent layer.