Invention Grant
- Patent Title: Light-emitting element
- Patent Title (中): 发光元件
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Application No.: US13419892Application Date: 2012-03-14
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Publication No.: US09175213B2Publication Date: 2015-11-03
- Inventor: Satoshi Seo , Satoko Shitagaki , Nobuharu Ohsawa , Hideko Inoue , Kunihiko Suzuki
- Applicant: Satoshi Seo , Satoko Shitagaki , 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: JP2011-064553 20110323
- Main IPC: H01J1/62
- IPC: H01J1/62 ; C09K11/06 ; C07D409/10 ; H01L51/00 ; H05B33/14 ; H01L51/50

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
- US20120242219A1 LIGHT-EMITTING ELEMENT Public/Granted day:2012-09-27
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