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:
Oct. 29, 2013
Filed:
Dec. 08, 2011
Nelson Tansu, Bethlehem, PA (US);
Xiaohang LI, Atlanta, GA (US);
Hongping Zhao, Cleveland Heights, OH (US);
Guangyu Liu, Bethlehem, PA (US);
James Foster Gilchrist, Pasadena, CA (US);
Pisist Kumnorkaew, Bethlehem, PA (US);
Nelson Tansu, Bethlehem, PA (US);
Xiaohang Li, Atlanta, GA (US);
Hongping Zhao, Cleveland Heights, OH (US);
Guangyu Liu, Bethlehem, PA (US);
James Foster Gilchrist, Pasadena, CA (US);
Pisist Kumnorkaew, Bethlehem, PA (US);
Lehigh University, Bethlehem, PA (US);
Abstract
A III-Nitride semiconductor LED provides broadband light emission, across all or most of the visible light wavelength spectrum, and a method for producing same. The LED includes a polarization field management template that has a three-dimensional patterned surface. The surface may be patterned with an array of hemispherical cavities, which may be formed by growing the template around a temporary template layer of spherical or other crystals. The method involves growing a quantum well layer on the patterned surface. The topographical variations in the patterned surface of the template cause corresponding topographical variations in the quantum well layer. These variations in spatial orientation of portions of the quantum well layer cause the polarization field of the quantum well layer to vary across the surface of the LED, which leads to energy transition shifting that provides 'white' light emission across a broad wavelength spectrum.