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:
Sep. 01, 2020
Filed:
Aug. 18, 2017
Nichia Corporation, Anan-shi, JP;
Hiroto Tamaki, Anan, JP;
NICHIA CORPORATION, Anan-shi, JP;
Abstract
A light emitting device including a light emitting element including an element substrate and semiconductor layers formed thereon, an encapsulating member that covers the sides of the light emitting element and forms a cavity at the upper surface of the light emitting element, and a wavelength-conversion layer in the cavity. The wavelength-conversion layer being capable of converting that converts the wavelength of light emitted by the light emitting element. The wavelength-conversion layer includes a first wavelength-conversion sub layer which is disposed at the upper surface of the light emitting element, and a second wavelength-conversion sub layer which is disposed on the first wavelength-conversion sub layer. The first wavelength-conversion sub layer includes first phosphors having a first resistance to environmental exposure, and the second wavelength-conversion sub layer includes second phosphors having a second resistance which is higher than that of the first wavelength-conversion sub layer.