Invention Grant
- Patent Title: Light-emitting element
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Application No.: US16261698Application Date: 2019-01-30
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Publication No.: US10586934B2Publication Date: 2020-03-10
- Inventor: Satoko Shitagaki , Satoshi Seo , Nobuharu Ohsawa , Hideko Inoue , Kunihiko Suzuki
- 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: Fish & Richardson P.C.
- Priority: JP2011-031462 20110216
- Main IPC: H01L51/00
- IPC: H01L51/00 ; C07D239/26 ; C07D241/12 ; C07D333/76 ; C07D409/10 ; C07D471/04 ; C07F15/00 ; H01L51/50 ; C07D209/86 ; C09K11/02 ; C09K11/06

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
- US20190157577A1 Light-Emitting Element Public/Granted day:2019-05-23
Information query
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