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:
Jan. 30, 2024
Filed:
Apr. 22, 2021
Semiconductor Energy Laboratory Co., Ltd., Kanagawa-ken, JP;
Yuta Kawano, Kanagawa, JP;
Airi Ueda, Kanagawa, JP;
Takeyoshi Watabe, Kanagawa, JP;
Nobuharu Ohsawa, Kanagawa, JP;
Keito Tosu, Kanagawa, JP;
Harue Osaka, Kanagawa, JP;
Satoshi Seo, Kanagawa, JP;
Ryo Narukawa, Kanagawa, JP;
Shiho Nomura, Kanagawa, JP;
Abstract
A light-emitting device with high emission efficiency is provided. The light-emitting device includes an anode, a cathode, and an EL layer positioned between the anode and the cathode. The EL layer includes a light-emitting layer and an electron-transport layer; the light-emitting layer includes a light-emitting material; the electron-transport layer includes an organic compound having an electron-transport property and a metal complex of an alkali metal; the ordinary refractive index of the organic compound having an electron-transport property in a peak wavelength of light emitted from the light-emitting material is greater than or equal to 1.50 and less than or equal to 1.75; and the ordinary refractive index of the metal complex of an alkali metal in the peak wavelength of the light emitted from the light-emitting material is greater than or equal to 1.45 and less than or equal to 1.70.