Invention Grant
- Patent Title: Light-emitting element
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Application No.: US15492439Application Date: 2017-04-20
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Publication No.: US10367160B2Publication Date: 2019-07-30
- Inventor: Satoshi Seo , Satoko Shitagaki , 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: JP2011-064553 20110323
- Main IPC: H01L51/50
- IPC: H01L51/50 ; C07D409/10 ; C09K11/06 ; H01L51/00 ; H05B33/14

Abstract:
A light-emitting element having high external quantum efficiency is provided. A light-emitting element having low drive voltage is provided. Provided is a light-emitting element which includes a light-emitting layer containing a phosphorescent compound, a first organic compound, and a second organic compound between a pair of electrodes. A combination of the first organic compound and the second organic compound forms an exciplex (excited complex). An emission spectrum of the exciplex overlaps with an absorption band located on the longest wavelength side of an absorption spectrum of the phosphorescent compound. A peak wavelength of the emission spectrum of the exciplex is longer than or equal to a peak wavelength of the absorption band located on the longest wavelength side of the absorption spectrum of the phosphorescent compound.
Public/Granted literature
- US20170279063A1 LIGHT-EMITTING ELEMENT Public/Granted day:2017-09-28
Information query
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