Invention Grant
- Patent Title: Light-emitting element
- Patent Title (中): 发光元件
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Application No.: US14285754Application Date: 2014-05-23
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Publication No.: US09123907B2Publication Date: 2015-09-01
- Inventor: Satoshi Seo , Satoko Shitagaki , Nobuharu Ohsawa , Hideko Inoue , Hiroshi Kadoma , Harue Osaka , Shunpei Yamazaki
- 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: JP2011-085423 20110407
- Main IPC: H05B33/14
- IPC: H05B33/14 ; H01L51/50 ; C09K11/06 ; H01L51/00

Abstract:
To provide a light-emitting element with high emission efficiency or long lifetime, in which the use amount of a phosphorescent compound is small. To provide a light-emitting element including a light-emitting layer between a pair of electrodes, wherein the light-emitting layer includes a phosphorescent compound, a first organic compound, and a second organic compound, and the combination of the first organic compound and the second organic compound forms an exciplex. The light-emitting element transfers energy by utilizing the overlap between the emission spectrum of the exciplex and the absorption spectrum of the phosphorescent compound and thus has high energy transfer efficiency, even when the concentration of the phosphorescent compound is low.
Public/Granted literature
- US20140252338A1 LIGHT-EMITTING ELEMENT Public/Granted day:2014-09-11
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