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:
Feb. 15, 2022
Filed:
Apr. 18, 2019
Dowa Electronics Materials Co., Ltd., Tokyo, JP;
Tomohiko Shibata, Akita, JP;
Takehiro Miyaji, Akita, JP;
DOWA Electronics Materials Co., Ltd., Tokyo, JP;
Abstract
A deep ultraviolet light-emitting element of this disclosure includes, in this order, an n-type semiconductor layer; a light-emitting layer; and a p-type semiconductor layer. An emission spectrum of the deep ultraviolet light-emitting element has a primary emission peak wavelength in a wavelength range of 200 nm or more and 350 nm or less, and a blue-violet secondary light emission component having a relative emission intensity of 0.03% to 10% across a wavelength range of 430 to 450 nm, a yellow-green secondary light emission component having a relative emission intensity of 0.03 to 10% across a wavelength range of 540 to 580 nm, when the relative emission intensities are expressed relative to an emission intensity at the primary emission peak wavelength taken as 100%. The ratio of an emission intensity at a wavelength of 435 nm to an emission intensity at a wavelength of 560 nm is 0.5 to 2.