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:
Jan. 20, 2015
Filed:
Jan. 31, 2012
Darshan Kundaliya, Beverly, MA (US);
Madis Raukas, Lexington, MA (US);
Adam M. Scotch, Amesbury, MA (US);
David Hamby, Andover, MA (US);
Kailash Mishra, North Chelmsford, MA (US);
Matthew Stough, Exeter, NH (US);
Darshan Kundaliya, Beverly, MA (US);
Madis Raukas, Lexington, MA (US);
Adam M. Scotch, Amesbury, MA (US);
David Hamby, Andover, MA (US);
Kailash Mishra, North Chelmsford, MA (US);
Matthew Stough, Exeter, NH (US);
OSRAM SYLVANIA Inc., Danvers, MA (US);
Abstract
A wavelength converter for an LED is described that comprises a substrate of monocrystalline garnet having a cubic crystal structure, a first lattice parameter and an oriented crystal face. An epitaxial layer is formed directly on the oriented crystal face of the substrate. The layer is comprised of a monocrystalline garnet phosphor having a cubic crystal structure and a second lattice parameter that is different from the first lattice parameter wherein the difference between the first lattice parameter and the second lattice parameter results in a lattice mismatch within a range of ±15%. The strain induced in the phosphor layer by the lattice mismatch shifts the emission of the phosphor to longer wavelengths when a tensile strain is induced and to shorter wavelengths when a compressive strain is induced. Preferably, the wavelength converter is mounted on the light emitting surface of a blue LED to produce an LED light source.