Invention Grant
- Patent Title: Light-emitting element, light-emitting device, lighting device, and electronic device
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Application No.: US13865368Application Date: 2013-04-18
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Publication No.: US08581266B2Publication Date: 2013-11-12
- Inventor: Hiromi Nowatari , Satoshi Seo , Nobuharu Ohsawa , Takahiro Ushikubo , Tetsuo Tsutsui
- Applicant: Semiconductor Energy Laboratory Co., Ltd.
- Applicant Address: JP Atsugi-shi, Kanagawa-ken
- Assignee: Semiconductor Energy Laboratory Co., Ltd.
- Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
- Current Assignee Address: JP Atsugi-shi, Kanagawa-ken
- Agency: Robinson Intellectual Property Law Office, P.C.
- Agent Eric J. Robinson
- Priority: JP2008-306425 20081201; JP2009-131518 20090529
- Main IPC: H01L27/15
- IPC: H01L27/15 ; H01L33/00

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.
Public/Granted literature
- US20130228766A1 LIGHT-EMITTING ELEMENT, LIGHT-EMITTING DEVICE, LIGHTING DEVICE, AND ELECTRONIC DEVICE Public/Granted day:2013-09-05
Information query
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