Light-emitting element, light-emitting device, and electronic appliance

    公开(公告)号:US09876187B2

    公开(公告)日:2018-01-23

    申请号:US12237042

    申请日:2008-09-24

    IPC分类号: H01J1/62 H01L51/50

    CPC分类号: H01L51/5048 H01L2251/552

    摘要: In a light-emitting element including an EL layer between a pair of electrodes, between an electrode functioning as an anode and a fourth layer having a light-emitting property (light-emitting layer), the EL layer includes at least a first layer having a hole-injecting property (hole-injecting layer), a second layer having a hole-transporting property (first hole-transporting layer), and a third layer having a hole-transporting property (second hole-transporting layer). The absolute value of the highest occupied molecular orbital level (HOMO level) of the second layer is larger than the absolute value of the highest occupied molecular orbital level (HOMO level) of each of the first layer and the third layer. With such a structure, the rate of transport of holes injected from the electrode functioning as an anode is reduced and emission efficiency of the light-emitting element is improved.

    Light-emitting element, light-emitting device, and electronic device
    10.
    发明授权
    Light-emitting element, light-emitting device, and electronic device 有权
    发光元件,发光元件及电子元件

    公开(公告)号:US09269906B2

    公开(公告)日:2016-02-23

    申请号:US12206252

    申请日:2008-09-08

    IPC分类号: H01L51/54 H01L51/00 H01L51/50

    摘要: It is an object to provide a light-emitting element having long lifetime. A light-emitting element is provided, in which a light-emitting layer, a first layer, and a second layer are provided between a first electrode and a second electrode; the first layer is provided between the light-emitting layer and the first electrode; the second layer is provided between the light-emitting layer and the second electrode; the first layer is a layer for controlling the hole transport; the second layer is a layer for controlling the electron transport; and light emission is obtained from the light-emitting layer by applying voltage to the first electrode and the second electrode such that the potential of the first electrode is higher than that of the second electrode.

    摘要翻译: 目的在于提供寿命长的发光元件。 提供一种发光元件,其中发光层,第一层和第二层设置在第一电极和第二电极之间; 第一层设置在发光层和第一电极之间; 第二层设置在发光层和第二电极之间; 第一层是用于控制空穴传输的层; 第二层是用于控制电子传输的层; 并且通过向第一电极和第二电极施加电压使得第一电极的电位高于第二电极的电位,从发光层获得发光。