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. 19, 2024
Filed:
Mar. 31, 2023
Denso Corporation, Kariya, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Mirise Technologies Corporation, Nisshin, JP;
Qd Laser, Inc., Kawasaki, JP;
Hitoshi Yamada, Nisshin, JP;
Yuki Kamata, Nisshin, JP;
Koichi Oyama, Nisshin, JP;
Yutaka Ohnishi, Kawasaki, JP;
Kenichi Nishi, Kawasaki, JP;
Keizo Takemasa, Kawasaki, JP;
DENSO CORPORATION, Kariya, JP;
TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota, JP;
MIRISE Technologies Corporation, Nisshin, JP;
QD LASER, Inc., Kawasaki, JP;
Abstract
In a semiconductor device, a quantum dot group includes a stack of plural quantum dot layers having different central wavelengths at which respective gains are maximum. A part of or all of the quantum dot layers are stacked so that the central wavelengths sequentially shifts along a stacking direction. The quantum dot group includes a longest wavelength layer group composed of some quantum dot layers including a longest wavelength layer having a longest central wavelength and at least one quantum dot layer stacked on the longest wavelength layer. The longest wavelength layer or the longest wavelength layer group has a larger gain at the central wavelength than the gain at the central wavelength of each of the other quantum dot layers.