Light-emitting device, electronic device, and lighting device

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United States of America Patent

PATENT NO 9876056
SERIAL NO

14818951

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A light-emitting device, an electronic device, or a lighting device with low power consumption and high reliability is provided. The light-emitting device includes a first light-emitting element, a second light-emitting element, a third light-emitting element, and a fourth light-emitting element. The first to fourth light-emitting elements include the same EL layer between an anode and a cathode. The EL layer includes a first light-emitting layer and a second light-emitting layer. The first light-emitting layer contains a fluorescent substance. The peak wavelength of an emission spectrum of the fluorescent substance in a toluene solution of the fluorescent substance is 440 nm to 460 nm, preferably 440 nm to 455 nm. The second light-emitting layer contains a phosphorescent substance. The first light-emitting element exhibits blue emission. The second light-emitting element exhibits green emission. The third light-emitting element exhibits red emission. The fourth light-emitting element exhibits yellow emission.

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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
Hashimoto, Naoaki Kanagawa, JP 92 492
Kawakami, Sachiko Kanagawa, JP 260 3237
Sasaki, Toshiki Kanagawa, JP 112 1889
Seo, Satoshi Kanagawa, JP 1449 27242
Suzuki, Tsunenori Kanagawa, JP 233 2551

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