Light-emitting element, light-emitting device, electronic device, lighting device, and organic compound

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United States of America Patent

PATENT NO 11552256
SERIAL NO

16570062

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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To provide a light-emitting element with an improved reliability, a light-emitting element with a high current efficiency (or a high quantum efficiency), and a novel dibenzo[f,h]quinoxaline derivative that is favorably used in a light-emitting element which is one embodiment of the present invention. A light-emitting element includes an EL layer between an anode and a cathode. The EL layer includes a light-emitting layer; the light-emitting layer contains a first organic compound having an electron-transport property and a hole-transport property, a second organic compound having a hole-transport property, and a light-emitting substance; the combination of the first organic compound and the second organic compound forms an exciplex; the HOMO level of the first organic compound is lower than the HOMO level of the second organic compound; and a difference between the HOMO level of the first organic compound and the HOMO level of the second organic compound is less than or equal to 0.4 eV.

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Patent Owner(s)

  • SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hamada, Takao Kanagawa, JP 41 618
Inoue, Hideko Kanagawa, JP 216 5545
Kitano, Yasushi Kanagawa, JP 25 259
Seo, Satoshi Kanagawa, JP 1452 27431
Suzuki, Hiroki Kanagawa, JP 102 802
Takahashi, Tatsuyoshi Kanagawa, JP 120 1305

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