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:
May. 16, 2017
Filed:
Oct. 27, 2015
Applicant:
Ngk Insulators, Ltd., Aichi-prefecture, JP;
Inventors:
Makoto Iwai, Kasugai, JP;
Masahiro Sakai, Nagoya, JP;
Katsuhiro Imai, Nagoya, JP;
Yoshitaka Kuraoka, Okazaki, JP;
Assignee:
NGK INSULATORS, LTD., Aichi, JP;
Primary Examiner:
Int. Cl.
CPC ...
H01L 33/00 (2010.01); C30B 25/00 (2006.01); H01L 33/32 (2010.01); C30B 9/10 (2006.01); C30B 19/02 (2006.01); C30B 29/40 (2006.01); H01L 33/20 (2010.01); C30B 25/02 (2006.01); H01L 33/02 (2010.01);
U.S. Cl.
CPC ...
H01L 33/32 (2013.01); C30B 9/10 (2013.01); C30B 19/02 (2013.01); C30B 29/406 (2013.01); H01L 33/20 (2013.01); C30B 25/02 (2013.01); H01L 33/02 (2013.01);
Abstract
The maximum value of peak intensities of cathode luminescence of a wavelength corresponding to a band gap of gallium nitride and in a measured visual field of 0.1 mm×0.1 mm is 140 percent or higher of an average value of the peak intensities of the cathode luminescence, provided that the peak intensities of the cathode luminescence are measured on a surface of the gallium nitride substrate.