Invention Grant
- Patent Title: Light-emitting element, light-emitting device, electronic device, and lighting device
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Application No.: US16898514Application Date: 2020-06-11
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Publication No.: US11387422B2Publication Date: 2022-07-12
- Inventor: Satoshi Seo , Takahiro Ishisone , Nobuharu Ohsawa , Yusuke Nonaka , 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: JP2014-112448 20140530,JP2014-241137 20141128
- Main IPC: H01L51/50
- IPC: H01L51/50 ; G09G3/3225 ; H01L27/32 ; H01L51/52

Abstract:
Emission efficiency of a light-emitting element is improved. The light-emitting element has a pair of electrodes and an EL layer between the pair of electrodes. The EL layer includes a first light-emitting layer and a second light-emitting layer. The first light-emitting layer includes a fluorescent material and a host material. The second light-emitting layer includes a phosphorescent material, a first organic compound, and a second organic compound. An emission spectrum of the second light-emitting layer has a peak in a yellow wavelength region. The first organic compound and the second organic compound form an exciplex.
Information query
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