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. 10, 2015
Filed:
Nov. 04, 2013
Semiconductor Energy Laboratory Co., Ltd., Atsugi-shi, Kanagawa-ken, JP;
Hiromi Nowatari, Atsugi, JP;
Satoshi Seo, Kawasaki, JP;
Nobuharu Ohsawa, Zama, JP;
Takahiro Ushikubo, Atsugi, JP;
Tetsuo Tsutsui, Kasuga, JP;
Semiconductor Energy Laboratory Co., Ltd., Atsugi-shi, Kanagawa-ken, JP;
Abstract
An object is to provide a light-emitting element which exhibits light emission with high luminance and can be driven at low voltage. Another object is to provide a light-emitting device or an electronic device with reduced power consumption. Between an anode and a cathode, n (n is a natural number of two or more) EL layers are provided, where between a first EL layer and a second EL layer, a first layer containing any of an alkali metal, an alkaline earth metal, a rare earth metal, an alkali metal compound, an alkaline earth metal compound, and a rare earth metal compound, a second layer containing a material having a high electron-transporting property in contact with the first layer, and a region containing a material having a high hole-transporting property and an acceptor material in contact with the second layer are provided in this order from the anode side.