Invention Grant
- Patent Title: Light-emitting element, display module, lighting module, light-emitting device, display device, electronic appliance, and lighting device
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Application No.: US17178417Application Date: 2021-02-18
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Publication No.: US11672136B2Publication Date: 2023-06-06
- Inventor: Nobuharu Ohsawa , Yusuke Nonaka , Takahiro Ishisone , Satoshi Seo , Takuya Kawata
- 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: JP 13249486 2013.12.02 JP 14097803 2014.05.09 JP 14180913 2014.09.05
- Main IPC: H10K50/13
- IPC: H10K50/13 ; H10K50/11 ; H10K59/32 ; H10K50/12 ; H10K50/15 ; H10K50/16 ; H10K85/30 ; H10K101/00 ; H10K85/60 ; H10K102/00

Abstract:
An object of one embodiment of the present invention is to provide a multicolor light-emitting element that utilizes fluorescence and phosphorescence and is advantageous for practical application. The light-emitting element has a stacked-layer structure of a first light-emitting layer containing a host material and a fluorescent substance, a separation layer containing a substance having a hole-transport property and a substance having an electron-transport property, and a second light-emitting layer containing two kinds of organic compounds that form an exciplex and a substance that can convert triplet excitation energy into luminescence. Note that a light-emitting element in which light emitted from the first light-emitting layer has an emission spectrum peak on the shorter wavelength side than an emission spectrum peak of the second light-emitting layer is more effective.
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