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. 04, 2013
Filed:
Mar. 28, 2011
Applicant:
Maria J. Anc, Groveland, MA (US);
Inventor:
Maria J. Anc, Groveland, MA (US);
Assignee:
Osram Sylvania Inc., Danvers, MA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01L 33/00 (2010.01);
U.S. Cl.
CPC ...
Abstract
There is herein described a LED lighting device utilizing quantum dots in layers on top of an LED chip. The quantum dots layers and the LED chip are arranged with gradient refractive indices, so that the refractive index of each layer is preferably less than the refractive index of the immediately underlying layer or chip. The quantum dots with emission peaks at longer wavelengths are preferably arranged in lower layers closer to the LED chip; while the quantum dots with emission peaks at shorter wavelengths are arranged in higher layers farther from the LED chip.