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:
Nov. 26, 2013
Filed:
Mar. 09, 2009
Theodore D. Moustakas, Dover, MA (US);
Adam Moldawer, Gainesville, FL (US);
Anirban Bhattacharyya, Boston, MA (US);
Joshua Abell, Washington, DC (US);
Theodore D. Moustakas, Dover, MA (US);
Adam Moldawer, Gainesville, FL (US);
Anirban Bhattacharyya, Boston, MA (US);
Joshua Abell, Washington, DC (US);
Trustees of Boston University, Boston, MA (US);
Abstract
A semiconductor emitter, or a precursor therefor, has a substrate and one or more textured semiconductor layers deposited onto the substrate in a nonpolar orientation. The textured layers enhance light extraction, and the use of nonpolar orientation greatly enhances internal quantum efficiency compared to conventional devices. Both the internal and external quantum efficiencies of emitters of the invention can be 70-80% or higher. The invention provides highly efficient light emitting diodes suitable for solid state lighting.