Invention Grant
- Patent Title: Light-emitting element, light-emitting device, and electronic device
- Patent Title (中): 发光元件,发光元件及电子元件
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Application No.: US11998400Application Date: 2007-11-29
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Publication No.: US07732811B2Publication Date: 2010-06-08
- Inventor: Satoko Shitagaki , Satoshi Seo , Ryoji Nomura
- Applicant: Satoko Shitagaki , Satoshi Seo , Ryoji Nomura
- Applicant Address: JP
- Assignee: Semiconductor Energy Laboratory Co., Ltd.
- Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
- Current Assignee Address: JP
- Agency: Husch Blackwell Sanders LLP
- Priority: JP2006-327662 20061204
- Main IPC: H01L35/24
- IPC: H01L35/24

Abstract:
A light-emitting element disclosed in the present invention includes a light-emitting layer and a first layer between a first electrode and a second electrode, in which the first layer is provided between the light-emitting layer and the first electrode. The present invention is characterized by the device structure in which the first layer comprising a hole-transporting material is doped with a hole-blocking material or an organic compound having a large dipole moment. This structure allows the formation of a high performance light-emitting element with high luminous efficiency and long lifetime. The device structure of the present invention facilitates the control of the rate of the carrier transport, and thus, leads to the formation of a light-emitting element with a well-controlled carrier balance, which contributes to the excellent characteristics of the light-emitting element of the present invention.
Public/Granted literature
- US20080142794A1 Light-emitting element, light-emitting device, and electronic device Public/Granted day:2008-06-19
Information query
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