Invention Publication
- Patent Title: Light-Emitting Element, Light-Emitting Device, Electronic Device, and Lighting Device
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Application No.: US18102914Application Date: 2023-01-30
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Publication No.: US20230180495A1Publication Date: 2023-06-08
- Inventor: Satoshi SEO , Tsunenori SUZUKI , Yusuke TAKITA , 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
- Priority: JP 16148511 2016.07.28
- Main IPC: H10K50/11
- IPC: H10K50/11 ; C07D209/82 ; H10K71/00 ; H10K71/16 ; H10K85/60

Abstract:
A novel light-emitting element is provided. A light-emitting element with a long lifetime is provided. A light-emitting element with high emission efficiency is provided. In the light-emitting element, an EL layer includes a hole-injection layer, a first hole-transport layer, a second hole-transport layer, a third hole-transport layer, a light-emitting layer, a first electron-transport layer, and a second electron-transport layer in this order; the hole-injection layer includes an organic acceptor; the LUMO level of the host material is higher than that of the first electron-transport layer; the LUMO level of the second electron-transport layer is higher than that of the first electron-transport layer; the host material is a substance including a condensed aromatic ring skeleton; and the first and second electron-transport layers each include a substance having a heteroaromatic ring skeleton.
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