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:
Dec. 13, 2016
Filed:
Jan. 05, 2015
Kla-tencor Corporation, Milpitas, CA (US);
Richard W. Solarz, Danville, CA (US);
KLA-Tencor Corporation, Milpitas, CA (US);
Abstract
A method of performing a hot test of a packaged phosphor converted light-emitting diode (pc-LED) includes selectively heating portions of the phosphor layer using a laser to provide a predetermined temperature gradient in the phosphor layer. The selective heating can directly heat the silicone in a silicone-based phosphor layer, or directly heat the active ion(s) of the phosphor in a Lumiramic™-based phosphor or even the active ion(s) of a silicone-based phosphor layer. A current is applied to the InGaN film to establish a predetermined temperature at the InGaN film junction, the film junction being adjacent to the phosphor layer. Photometric measurements are performed on the LED after the selective heating and during the applied electroluminescent current. This method quickly establishes the temperatures and temperature gradients in the LED consistent with those of an operating, product-level LED, thereby ensuring accurate binning of the LED.