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    Light-Emitting Element, Light-Emitting Device, Electronic Appliance, and Lighting Device
    4.
    发明申请
    Light-Emitting Element, Light-Emitting Device, Electronic Appliance, and Lighting Device 审中-公开

    公开(公告)号：US20180151815A1

    公开(公告)日：2018-05-31

    申请号：US15882178

    申请日：2018-01-29

    Applicant: Semiconductor Energy Laboratory Co., Ltd.

    Inventor： Tsunenori Suzuki ,  Naoaki Hashimoto ,  Eriko Saijo ,  Satoshi Seo

    IPC: H01L51/00 ,  H01L51/50

    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.

    Light-Emitting Element, Light-Emitting Device, Electronic Appliance, and Lighting Device
    5.
    发明申请
    Light-Emitting Element, Light-Emitting Device, Electronic Appliance, and Lighting Device 有权
    发光元件，发光器件，电子设备和照明器件

    公开(公告)号：US20140291647A1

    公开(公告)日：2014-10-02

    申请号：US14226360

    申请日：2014-03-26

    Applicant: Semiconductor Energy Laboratory Co., Ltd.

    Inventor： Tsunenori Suzuki ,  Naoaki Hashimoto ,  Eriko Saijo ,  Satoshi Seo

    IPC: H01L51/00

    CPC classification number: H01L51/0085 ,  H01L51/0054 ,  H01L51/0059 ,  H01L51/006 ,  H01L51/0072 ,  H01L51/0074 ,  H01L51/5012 ,  H01L51/5016 ,  H01L51/504 ,  H01L51/5072 ,  H01L2251/5376 ,  H01L2251/5384 ,  H01L2251/552

    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.

    Abstract translation: 提供了包括一对电极之间的多个发光层并且具有低驱动电压和高发光效率的发光元件。 提供了包括阴极和阳极之间的第一至第三发光层的发光元件。 第一发光层包括第一磷光材料和第一电子传输材料; 第二发光层包括第二磷光材料和第二电子传输材料; 第三发光层包括荧光材料和第三电子传输材料; 第一至第三发光元件设置成与位于阴极侧的电子传输层接触; 并且包含在电子传输层中的材料的三重激发能级低于第一电子传输材料和第二电子传输材料的三重激发能级。

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