18814781. LIGHT-EMITTING DEVICE, LIGHT-EMITTING APPARATUS, ELECTRONIC DEVICE, AND LIGHTING DEVICE (SEMICONDUCTOR ENERGY LABORATORY CO., LTD.)

LIGHT-EMITTING DEVICE, LIGHT-EMITTING APPARATUS, ELECTRONIC DEVICE, AND LIGHTING DEVICE

Organization Name

SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor(s)

Satoshi Seo of Sagamihara (JP)

Tsunenori Suzuki of Yokohama (JP)

Takumu Okuyama of Atsugi (JP)

Yusuke Takita of Yokohama (JP)

Naoaki Hashimoto of Sagamihara (JP)

Hiromi Seo of Sagamihara (JP)

Nobuharu Ohsawa of Zama (JP)

Toshiki Sasaki of Isehara (JP)

Shunpei Yamazaki of Tokyo (JP)

LIGHT-EMITTING DEVICE, LIGHT-EMITTING APPARATUS, ELECTRONIC DEVICE, AND LIGHTING DEVICE

This abstract first appeared for US patent application 18814781 titled 'LIGHT-EMITTING DEVICE, LIGHT-EMITTING APPARATUS, ELECTRONIC DEVICE, AND LIGHTING DEVICE

Original Abstract Submitted

A novel light-emitting device is provided. Alternatively, a light-emitting device with high emission efficiency is provided. Alternatively, a light-emitting device having a long lifetime is provided. Alternatively, a light-emitting device having low driving voltage is provided. A light-emitting device including an EL layer including a first layer, a second layer, a third layer, a light-emitting layer, and a fourth layer in this order from the anode side is provided. The first layer includes a first organic compound and a second organic compound. The fourth layer includes a seventh organic compound. The first organic compound exhibits an electron-accepting property with respect to the second organic compound. The HOMO level of the second organic compound is from −5.7 eV to −5.4 eV. The HOMO level of the seventh organic compound is −6.0 eV or higher.