Invention Grant
- Patent Title: Light-emitting element, light-emitting device, electronic appliance, and lighting device
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Application No.: US17138394Application Date: 2020-12-30
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Publication No.: US11672177B2Publication Date: 2023-06-06
- Inventor: Hiromi Seo , Satoshi Seo , Satoko Shitagaki
- Applicant: Semiconductor Energy Laboratory Co., Ltd.
- Applicant Address: JP Kanagawa-ken
- Assignee: Semiconductor Energy Laboratory Co., Ltd.
- Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
- Current Assignee Address: JP Kanagawa-ken
- Agency: Husch Blackwell LLP
- Priority: JP 2012096887 2012.04.20
- Main IPC: H01L29/08
- IPC: H01L29/08 ; H01L35/24 ; H01L51/00 ; H01L51/50

Abstract:
A light-emitting element which has low driving voltage and high emission efficiency is provided. The light-emitting element includes, between a pair of electrodes, a hole-transport layer and a light-emitting layer over the hole-transport layer. The light-emitting layer contains a first organic compound having an electron-transport property, a second organic compound having a hole-transport property, and a light-emitting third organic compound converting triplet excitation energy into light emission. A combination of the first organic compound and the second organic compound forms an exciplex. The hole-transport layer contains at least a fourth organic compound whose HOMO level is lower than or equal to that of the second organic compound and a fifth organic compound whose HOMO level is higher than that of the second organic compound.
Public/Granted literature
- US20210119150A1 LIGHT-EMITTING ELEMENT, LIGHT-EMITTING DEVICE, ELECTRONIC APPLIANCE, AND LIGHTING DEVICE Public/Granted day:2021-04-22
Information query
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