公开(公告)号：US11917840B2

公开(公告)日：2024-02-27

申请号：US17055933

申请日：2019-05-10

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Satoshi Seo ,  Toshiki Sasaki ,  Ryohei Yamaoka ,  Shiho Nomura

IPC: H10K50/11 ,  H10K50/818 ,  H10K50/828

CPC classification number: H10K50/11 ,  H10K50/818 ,  H10K50/828

Abstract: A novel light-emitting device with high emission efficiency is provided. A light-emitting device with a high blue index (BI) is provided. A light-emitting device with low power consumption is provided. A light-emitting device including a first electrode and a second electrode which are a reflective electrode and a semi-transmissive and semi-reflective electrode, and an EL layer sandwiched between the first electrode and the second electrode, where the EL layer contains an emission center substance, where when the emission center substance in the EL layer includes only one kind of substance, photon energy of a peak wavelength of light emitted from the light-emitting device is designed from an average value of photon energy of light emitted by the emission center substance in a solution state and emission edge energy on a short wavelength side of an emission spectrum of the emission center substance in the solution state.

公开(公告)号：US20180151630A1

公开(公告)日：2018-05-31

申请号：US15825831

申请日：2017-11-29

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Ryohei Yamaoka ,  Satoshi Seo ,  Shogo Uesaka ,  Shiho Nomura

IPC: H01L27/32 ,  H01L51/52 ,  H01L51/50 ,  G09G3/3258 ,  G09G3/3233

CPC classification number: H01L27/3209 ,  G09G3/3233 ,  G09G3/3258 ,  G09G2300/0842 ,  H01L51/5016 ,  H01L51/504 ,  H01L51/5056 ,  H01L51/5203 ,  H01L51/5265 ,  H01L51/5278

Abstract: A highly reliable light-emitting element which can keep favorable characteristics throughout long-time driving is provided. In addition, a light-emitting element with high color purity and high emission efficiency is provided. Furthermore, a light-emitting device having a long lifetime in which the light-emitting element is used is provided. Moreover, an electronic device and a lighting device each of which has a long lifetime are provided. In the light-emitting element including an EL layer between a pair of electrodes, the EL layer has a stacked-layer structure of a first light-emitting layer, a second light-emitting layer, and a third light-emitting layer. The light-emitting layer includes an electron-transport material, a hole-transport material, and a light-emitting material. Furthermore, light emitted from the first light-emitting layer and light emitted from the third light-emitting layer have the same color and each have a longer wavelength than light emitted from the second light-emitting layer.

公开(公告)号：US11889712B2

公开(公告)日：2024-01-30

申请号：US17237262

申请日：2021-04-22

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Yuta Kawano ,  Airi Ueda ,  Takeyoshi Watabe ,  Nobuharu Ohsawa ,  Keito Tosu ,  Harue Osaka ,  Satoshi Seo ,  Ryo Narukawa ,  Shiho Nomura

IPC: H10K50/16 ,  H10K59/00 ,  H10K59/12 ,  H10K85/60 ,  H10K85/30 ,  H10K85/00

CPC classification number: H10K50/16 ,  H10K59/00 ,  H10K59/12 ,  H10K85/00 ,  H10K85/30 ,  H10K85/615 ,  H10K85/631 ,  H10K85/654 ,  H10K85/6572 ,  H10K85/6574

Abstract: A light-emitting device with high emission efficiency is provided. The light-emitting device includes an anode, a cathode, and an EL layer positioned between the anode and the cathode. The EL layer includes a light-emitting layer and an electron-transport layer; the light-emitting layer includes a light-emitting material; the electron-transport layer includes an organic compound having an electron-transport property and a metal complex of an alkali metal; the ordinary refractive index of the organic compound having an electron-transport property in a peak wavelength of light emitted from the light-emitting material is greater than or equal to 1.50 and less than or equal to 1.75; and the ordinary refractive index of the metal complex of an alkali metal in the peak wavelength of the light emitted from the light-emitting material is greater than or equal to 1.45 and less than or equal to 1.70.

公开(公告)号：US10510806B2

公开(公告)日：2019-12-17

申请号：US15825831

申请日：2017-11-29

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Ryohei Yamaoka ,  Satoshi Seo ,  Shogo Uesaka ,  Shiho Nomura

IPC: H01L27/32 ,  H01L51/52 ,  H01L51/50 ,  G09G3/3258 ,  G09G3/3233

Abstract: A highly reliable light-emitting element which can keep favorable characteristics throughout long-time driving is provided. In addition, a light-emitting element with high color purity and high emission efficiency is provided. Furthermore, a light-emitting device having a long lifetime in which the light-emitting element is used is provided. Moreover, an electronic device and a lighting device each of which has a long lifetime are provided. In the light-emitting element including an EL layer between a pair of electrodes, the EL layer has a stacked-layer structure of a first light-emitting layer, a second light-emitting layer, and a third light-emitting layer. The light-emitting layer includes an electron-transport material, a hole-transport material, and a light-emitting material. Furthermore, light emitted from the first light-emitting layer and light emitted from the third light-emitting layer have the same color and each have a longer wavelength than light emitted from the second light-emitting layer.