Invention Grant
- Patent Title: Light-emitting element, light-emitting device, display device, electronic device, and lighting device
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Application No.: US18213584Application Date: 2023-06-23
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Publication No.: US12029059B2Publication Date: 2024-07-02
- Inventor: Satoshi Seo , Takahiro Ishisone
- 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
- Agency: Husch Blackwell LLP
- Priority: JP 12177795 2012.08.10
- Main IPC: H10K50/13
- IPC: H10K50/13 ; H01L33/00 ; H10K50/11 ; H10K50/15 ; H10K50/16 ; H10K50/81 ; H10K50/82 ; H10K59/35 ; H10K59/38 ; H10K101/00 ; H10K101/10 ; H10K101/30 ; H10K101/40

Abstract:
A light-emitting element which uses a plurality of kinds of light-emitting dopants emitting light in a balanced manner and has high emission efficiency is provided. Further, a light-emitting device, a display device, an electronic device, and a lighting device each having reduced power consumption by using the above light-emitting element are provided. A light-emitting element which includes a plurality of light-emitting layers including different phosphorescent materials is provided. In the light-emitting element, the light-emitting layer which includes a light-emitting material emitting light with a long wavelength includes two kinds of carrier-transport compounds having properties of transporting carriers with different polarities. Further, in the light-emitting element, the triplet excitation energy of a host material included in the light-emitting layer emitting light with a short wavelength is higher than the triplet excitation energy of at least one of the carrier-transport compounds.
Public/Granted literature
- US20230413595A1 Light-Emitting Element, Light-Emitting Device, Display Device, Electronic Device, And Lighting Device Public/Granted day:2023-12-21
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