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:
Dec. 09, 2025
Filed:
Jul. 26, 2022
Magnolia White Corporation, Tokyo, JP;
Asami Sakamoto, Tokyo, JP;
MAGNOLIA WHITE CORPORATION, Tokyo, JP;
Abstract
Disclosed is a light-emitting element including an anode, a first functional layer over the anode, an emission layer over and in contact with the first functional layer, an electron-transporting layer over the emission layer, and a cathode over the electron-transporting layer. The first functional layer includes a first hole-transporting material and a hole-trapping material. The emission layer includes a host material, an emission material, and the hole-trapping material. Concentrations of the hole-trapping material are lower than concentrations of the first hole-transporting material and the host material in the first functional layer and the emission layer, respectively. A highest occupied molecular orbital level of the hole-trapping material is higher than a highest occupied molecular orbital level of the first hole-transporting material and a highest occupied molecular orbital level of the host material.