Invention Grant
- Patent Title: Light-emitting element, light-emitting device, electronic device, and lighting device
- Patent Title (中): 发光元件,发光元件,电子元件及照明器具
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Application No.: US12785648Application Date: 2010-05-24
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Publication No.: US08502202B2Publication Date: 2013-08-06
- Inventor: Hiromi Nowatari , Satoshi Seo , Nobuharu Ohsawa , Takahiro Ushikubo , Tetsuo Tsutsui
- Applicant: Hiromi Nowatari , Satoshi Seo , Nobuharu Ohsawa , Takahiro Ushikubo , Tetsuo Tsutsui
- 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: JP2009-131096 20090529
- Main IPC: H01L29/08
- IPC: H01L29/08

Abstract:
An object is to provide a light-emitting element capable of emitting light with a high luminance even at a low voltage, and having a long lifetime. The light-emitting element includes n EL layers between an anode and a cathode (n is a natural number of two or more), and also includes, between m-th EL layer from the anode and (m+1)-th EL layer (m is a natural number, 1≦m≦n−1), a first layer including a first donor material in contact with the m-th EL layer, a second layer including an electron-transport material and a second donor material in contact with the first layer, and a third layer including a hole-transport material and an acceptor material in contact with the second layer and the (m+1)-th EL layer.
Public/Granted literature
- US20100301317A1 LIGHT-EMITTING ELEMENT, LIGHT-EMITTING DEVICE, ELECTRONIC DEVICE, AND LIGHTING DEVICE Public/Granted day:2010-12-02
Information query
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