Invention Grant
- Patent Title: Light-emitting element, light-emitting device, electronic device, and lighting device
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Application No.: US17392842Application Date: 2021-08-03
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Publication No.: US11889759B2Publication Date: 2024-01-30
- Inventor: Satoshi Seo , Tsunenori Suzuki , Naoaki Hashimoto
- 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 15099866 2015.05.15 JP 16049620 2016.03.14
- Main IPC: H10K85/60
- IPC: H10K85/60 ; H10K50/11 ; H10K50/155 ; H10K50/16 ; H10K50/84 ; H10K101/40 ; H10K101/30

Abstract:
Provided is a novel light-emitting element, a light-emitting element with a long lifetime, or a light-emitting element with high emission efficiency. The light-emitting element includes an EL layer between a pair of electrodes. The EL layer includes at least a light-emitting layer containing a fluorescent substance and a host material, a first electron-transport layer containing a first electron-transport material, and a second electron-transport layer containing a second electron-transport material, which are in contact with each other and in this order. The LUMO level of each of the host material and the second electron-transport material is higher than the LUMO level of the first electron-transport material.
Public/Granted literature
- US20210367165A1 Light-Emitting Element, Light-Emitting Device, Electronic Device, and Lighting Device Public/Granted day:2021-11-25
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