Invention Grant
- Patent Title: Light-emitting device including light-emitting layer and electron-transport layer
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Application No.: US17416754Application Date: 2019-12-17
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Publication No.: US12101997B2Publication Date: 2024-09-24
- Inventor: Naoaki Hashimoto , Satoshi Seo , Tsunenori Suzuki , Yusuke Takita , Takumu Okuyama , Nobuharu Ohsawa , Shunpei Yamazaki , Toshiki Sasaki
- Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
- Applicant Address: JP Atsugi
- Assignee: Semiconductor Energy Laboratory Co., Ltd.
- Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
- Current Assignee Address: JP Atsugi
- Agency: Fish & Richardson P.C.
- Priority: JP 18247999 2018.12.28 JP 19020056 2019.02.06 JP 19028460 2019.02.20 JP 19080376 2019.04.19 JP 19087061 2019.04.30
- International Application: PCT/IB2019/060883 2019.12.17
- International Announcement: WO2020/136499A 2020.07.02
- Date entered country: 2021-06-21
- Main IPC: H10K50/16
- IPC: H10K50/16 ; H10K50/11 ; H10K85/30 ; H10K85/60 ; H10K101/30

Abstract:
A novel light-emitting device, a light-emitting device with high emission efficiency, a light-emitting device with a long lifetime, or a light-emitting device with low driving voltage is provided. An EL layer includes a first layer, a second layer, a third layer, a light-emitting layer, and a fourth layer in this order from the anode side. The first layer contains a first organic compound and a second organic compound. The fourth layer contains a seventh organic compound. The first organic compound exhibits an electron-accepting property with respect to the second organic compound. A HOMO level of the second organic compound is higher than or equal to −5.7 eV and lower than or equal to −5.4 eV. The fourth layer includes a region where the amount of seventh organic compound is large and a region where the amount of seventh organic compound is small in the thickness direction.
Public/Granted literature
- US20220077397A1 LIGHT-EMITTING DEVICE, LIGHT-EMITTING APPARATUS, ELECTRONIC DEVICE, AND LIGHTING DEVICE Public/Granted day:2022-03-10
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