Patents by Inventor Eriko Saijo

Eriko Saijo has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Light-emitting element, light-emitting device, electronic appliance, and lighting device
    Patent number: 11723264
    Abstract: A light-emitting element which includes a plurality of light-emitting layers between a pair of electrodes and has low driving voltage and high emission efficiency is provided. A light-emitting element including first to third light-emitting layers between a cathode and an anode is provided. The first light-emitting layer includes a first phosphorescent material and a first electron-transport material; the second light-emitting layer includes a second phosphorescent material and a second electron-transport material; the third light-emitting layer includes a fluorescent material and a third electron-transport material; the first to third light-emitting elements are provided in contact with an electron-transport layer positioned on a cathode side; and a triplet excitation energy level of a material included in the electron-transport layer is lower than triplet excitation energy levels of the first electron-transport material and the second electron-transport material.
    Type: Grant
    Filed: March 11, 2021
    Date of Patent: August 8, 2023
    Inventors: Tsunenori Suzuki, Naoaki Hashimoto, Eriko Saijo, Satoshi Seo
  • Light-Emitting Element, Light-Emitting Device, Electronic Appliance, and Lighting Device
    Publication number: 20210202866
    Abstract: A light-emitting element which includes a plurality of light-emitting layers between a pair of electrodes and has low driving voltage and high emission efficiency is provided. A light-emitting element including first to third light-emitting layers between a cathode and an anode is provided. The first light-emitting layer includes a first phosphorescent material and a first electron-transport material; the second light-emitting layer includes a second phosphorescent material and a second electron-transport material; the third light-emitting layer includes a fluorescent material and a third electron-transport material; the first to third light-emitting elements are provided in contact with an electron-transport layer positioned on a cathode side; and a triplet excitation energy level of a material included in the electron-transport layer is lower than triplet excitation energy levels of the first electron-transport material and the second electron-transport material.
    Type: Application
    Filed: March 11, 2021
    Publication date: July 1, 2021
    Applicant: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Tsunenori Suzuki, Naoaki HASHIMOTO, Eriko SAIJO, Satoshi SEO
  • Light-Emitting Element, Light-Emitting Device, Electronic Appliance, and Lighting Device
    Publication number: 20180151815
    Abstract: A light-emitting element which includes a plurality of light-emitting layers between a pair of electrodes and has low driving voltage and high emission efficiency is provided. A light-emitting element including first to third light-emitting layers between a cathode and an anode is provided. The first light-emitting layer includes a first phosphorescent material and a first electron-transport material; the second light-emitting layer includes a second phosphorescent material and a second electron-transport material; the third light-emitting layer includes a fluorescent material and a third electron-transport material; the first to third light-emitting elements are provided in contact with an electron-transport layer positioned on a cathode side; and a triplet excitation energy level of a material included in the electron-transport layer is lower than triplet excitation energy levels of the first electron-transport material and the second electron-transport material.
    Type: Application
    Filed: January 29, 2018
    Publication date: May 31, 2018
    Applicant: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Tsunenori Suzuki, Naoaki Hashimoto, Eriko Saijo, Satoshi Seo
  • Light-emitting element, light-emitting device, electronic appliance, and lighting device
    Patent number: 9893303
    Abstract: A light-emitting element which includes a plurality of light-emitting layers between a pair of electrodes and has low driving voltage and high emission efficiency is provided. A light-emitting element including first to third light-emitting layers between a cathode and an anode is provided. The first light-emitting layer includes a first phosphorescent material and a first electron-transport material; the second light-emitting layer includes a second phosphorescent material and a second electron-transport material; the third light-emitting layer includes a fluorescent material and a third electron-transport material; the first to third light-emitting elements are provided in contact with an electron-transport layer positioned on a cathode side; and a triplet excitation energy level of a material included in the electron-transport layer is lower than triplet excitation energy levels of the first electron-transport material and the second electron-transport material.
    Type: Grant
    Filed: March 26, 2014
    Date of Patent: February 13, 2018
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Tsunenori Suzuki, Naoaki Hashimoto, Eriko Saijo, Satoshi Seo
  • Light-Emitting Element, Light-Emitting Device, Electronic Appliance, and Lighting Device
    Publication number: 20140291647
    Abstract: A light-emitting element which includes a plurality of light-emitting layers between a pair of electrodes and has low driving voltage and high emission efficiency is provided. A light-emitting element including first to third light-emitting layers between a cathode and an anode is provided. The first light-emitting layer includes a first phosphorescent material and a first electron-transport material; the second light-emitting layer includes a second phosphorescent material and a second electron-transport material; the third light-emitting layer includes a fluorescent material and a third electron-transport material; the first to third light-emitting elements are provided in contact with an electron-transport layer positioned on a cathode side; and a triplet excitation energy level of a material included in the electron-transport layer is lower than triplet excitation energy levels of the first electron-transport material and the second electron-transport material.
    Type: Application
    Filed: March 26, 2014
    Publication date: October 2, 2014
    Applicant: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Tsunenori Suzuki, Naoaki Hashimoto, Eriko Saijo, Satoshi Seo