Invention Grant
- Patent Title: Light-emitting element, light-emitting device, display device, electronic device, and lighting device
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Application No.: US16188527Application Date: 2018-11-13
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Publication No.: US10797257B2Publication Date: 2020-10-06
- Inventor: Satoshi Seo , Shunpei Yamazaki , Takahiro Ishisone
- Applicant: Semiconductor Energy Laboratory Co., Ltd.
- Applicant Address: JP Atsugi-shi, Kanagawa-ken
- Assignee: Semiconductor Energy Laboratory Co., Ltd.
- Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
- Current Assignee Address: JP Atsugi-shi, Kanagawa-ken
- Agency: Fish & Richardson P.C.
- Priority: com.zzzhc.datahub.patent.etl.us.BibliographicData$PriorityClaim@5870f256 com.zzzhc.datahub.patent.etl.us.BibliographicData$PriorityClaim@5ec68b3e
- Main IPC: H01L51/50
- IPC: H01L51/50 ; H01L51/00 ; H01L51/52

Abstract:
An object is to provide a light-emitting element which uses a plurality of kinds of light-emitting dopants and has high emission efficiency. In one embodiment of the present invention, a light-emitting device, a light-emitting module, a light-emitting display device, an electronic device, and a lighting device each having reduced power consumption by using the above light-emitting element are provided. Attention is paid to Förster mechanism, which is one of mechanisms of intermolecular energy transfer. Efficient energy transfer by Förster mechanism is achieved by making an emission wavelength of a molecule which donates energy overlap with the longest-wavelength-side local maximum peak of a graph obtained by multiplying an absorption spectrum of a molecule which receives energy by a wavelength raised to the fourth power.
Public/Granted literature
- US20190097152A1 Light-Emitting Element, Light-Emitting Device, Display Device, Electronic Device, and Lighting Device Public/Granted day:2019-03-28
Information query
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