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. 20, 2012
Filed:
Feb. 24, 2010
Masayuki Mitsuya, Chino, JP;
Koji Yasukawa, Suwa, JP;
Masayuki Mitsuya, Chino, JP;
Koji Yasukawa, Suwa, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
Provided is a light-emitting element including a cathode; an anode; a first light-emitting layer that is disposed between the cathode and the anode and emits in a first color; a second light-emitting layer that is disposed between the first light-emitting layer and the cathode and emits in a second color that is different from the first color; and an intermediate layer that is disposed between the first light-emitting layer and the second light-emitting layer so as to be in contact with these layers and has a function of controlling the migration of holes and electrons between the first light-emitting layer and the second light-emitting layer. The intermediate layer is constituted of a first layer that is in contact with the first light-emitting layer and is constituted of a hole-transporting material serving as a main material and a second layer that is in contact with the first layer and also with the second light-emitting layer and is constituted of a material mixture, serving as a main material, of a material having an acene skeleton and a hole-transporting material.