Invention Grant
- Patent Title: Light-emitting element
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Application No.: US13370679Application Date: 2012-02-10
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Publication No.: US09604928B2Publication Date: 2017-03-28
- Inventor: Satoko Shitagaki , Satoshi Seo , Nobuharu Ohsawa , Hideko Inoue , Kunihiko Suzuki
- Applicant: Satoko Shitagaki , Satoshi Seo , Nobuharu Ohsawa , Hideko Inoue , Kunihiko Suzuki
- 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: JP2011-031462 20110216
- Main IPC: H01L29/08
- IPC: H01L29/08 ; H01L21/00 ; C07D209/86 ; C07D239/26 ; C07D241/12 ; C07D333/76 ; C07D409/10 ; C07D471/04 ; C07F15/00 ; H01L51/00 ; H01L51/50
Abstract:
A light-emitting element having high external quantum efficiency is provided. A light-emitting element having a long lifetime is provided. A light-emitting element is provided which includes a light-emitting layer containing a phosphorescent compound, a first organic compound, and a second organic compound between a pair of electrodes, in which a combination of the first organic compound and the second organic compound forms an exciplex (excited complex). The light-emitting element transfers energy by utilizing an overlap between the emission spectrum of the exciplex and the absorption spectrum of the phosphorescent compound and thus has high energy transfer efficiency. Therefore, a light-emitting element having high external quantum efficiency can be obtained.
Public/Granted literature
- US20120205632A1 LIGHT-EMITTING ELEMENT Public/Granted day:2012-08-16
Information query
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