Invention Grant
- Patent Title: Light-emitting element, light-emitting device, electronic device, and lighting device
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Application No.: US15825831Application Date: 2017-11-29
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Publication No.: US10510806B2Publication Date: 2019-12-17
- Inventor: Ryohei Yamaoka , Satoshi Seo , Shogo Uesaka , Shiho Nomura
- Applicant: Semiconductor Energy Laboratory Co., Ltd.
- Applicant Address: JP
- Assignee: Semiconductor Energy Laboratory Co., Ltd.
- Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
- Current Assignee Address: JP
- Agency: Husch Blackwell LLP
- Priority: JP2016-232765 20161130
- Main IPC: H01L27/32
- IPC: H01L27/32 ; H01L51/52 ; H01L51/50 ; G09G3/3258 ; G09G3/3233

Abstract:
A highly reliable light-emitting element which can keep favorable characteristics throughout long-time driving is provided. In addition, a light-emitting element with high color purity and high emission efficiency is provided. Furthermore, a light-emitting device having a long lifetime in which the light-emitting element is used is provided. Moreover, an electronic device and a lighting device each of which has a long lifetime are provided. In the light-emitting element including an EL layer between a pair of electrodes, the EL layer has a stacked-layer structure of a first light-emitting layer, a second light-emitting layer, and a third light-emitting layer. The light-emitting layer includes an electron-transport material, a hole-transport material, and a light-emitting material. Furthermore, light emitted from the first light-emitting layer and light emitted from the third light-emitting layer have the same color and each have a longer wavelength than light emitted from the second light-emitting layer.
Public/Granted literature
- US20180151630A1 Light-Emitting Element, Light-Emitting Device, Electronic Device, and Lighting Device Public/Granted day:2018-05-31
Information query
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