Invention Grant
- Patent Title: Light-emitting element, light-emitting device, electronic appliance, and lighting device
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Application No.: US17198566Application Date: 2021-03-11
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Publication No.: US11723264B2Publication Date: 2023-08-08
- Inventor: Tsunenori Suzuki , Naoaki Hashimoto , Eriko Saijo , Satoshi Seo
- 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 13065394 2013.03.27
- Main IPC: H01L51/00
- IPC: H01L51/00 ; H01L51/50 ; H10K85/30 ; H10K50/11 ; H10K50/13 ; H10K50/16 ; H10K101/10 ; H10K85/60 ; H10K101/00 ; H10K101/30

Abstract:
A light-emitting element which includes a plurality of light-emitting layers between a pair of electrodes and has low driving voltage and high emission efficiency is provided. A light-emitting element including first to third light-emitting layers between a cathode and an anode is provided. The first light-emitting layer includes a first phosphorescent material and a first electron-transport material; the second light-emitting layer includes a second phosphorescent material and a second electron-transport material; the third light-emitting layer includes a fluorescent material and a third electron-transport material; the first to third light-emitting elements are provided in contact with an electron-transport layer positioned on a cathode side; and a triplet excitation energy level of a material included in the electron-transport layer is lower than triplet excitation energy levels of the first electron-transport material and the second electron-transport material.
Public/Granted literature
- US20210202866A1 Light-Emitting Element, Light-Emitting Device, Electronic Appliance, and Lighting Device Public/Granted day:2021-07-01
Information query
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