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Organoelectroluminescent element, and light emission device, display device, and illumination device in which said organoelectroluminescent element is used

專利號(hào)
US11177450B2
公開(kāi)日期
2021-11-16
申請(qǐng)人
Naoyuki Hayashi; Hideki Yasuda; Koji Takaku（IE Dublin）
發(fā)明人
Naoyuki Hayashi; Hideki Yasuda; Koji Takaku
IPC分類
H01L51/50; H01L51/00
技術(shù)領(lǐng)域
group,layer,atom,preferably,emitting,ligand,ring,light,nm,in
地域： Kanagawa

摘要

An organoelectroluminescent element which can satisfy both a high external quantum efficiency and high power efficiency at the same time, which has on a substrate an anode, a first intermediate organic layer composed of at least one organic layer, a light-emitting layer, a second intermediate organic layer composed of at least one organic layer, and a cathode in this order, and in which light is extracted from the aforementioned anode side, wherein the aforementioned light-emitting layer contains a light-emitting material that is oriented in the horizontal direction with the substrate, the order parameter of the aforementioned light-emitting material in the aforementioned light-emitting layer is at least 0.7, and the relationship between the thickness T1 (nm) of the aforementioned first intermediate organic layer and the thickness T2 (nm) of the aforementioned second intermediate organic layer is such that 1.1

說(shuō)明書(shū)

There are no particular restrictions on the configuration of the organic layers that are present in an organoelectroluminescent element as long as the aforementioned conditions are satisfied, which can be suitably selected according to the purpose and application of the organoelectroluminescent element. The organic layers are formed on the front face [sic]4 or one face of the aforementioned anode or the aforementioned cathode. 4 Translator's note: The word for “front face” here is probably an error in the original for “entire surface,” which happens to be homophonous in Japanese.

Concrete examples of the layer configuration are as follows, but the present invention is in no way limited to these configurations. Note that in the following layer configurations, the layers described between the anode and the light-emitting layer correspond to the first intermediate organic layer if they are organic layers, and the layers described between the light-emitting layer and the cathode correspond to the second intermediate organic layer.

    • anode/hole transport layer/light-emitting layer/electron transport layer/cathode
    • anode/hole transport layer/light-emitting layer/blocking layer/electron transport layer/cathode
    • anode/hole transport layer/light-emitting layer/blocking layer/electron transport layer/electron injection layer/cathode
    • anode/hole injection layer/hole transport layer/light-emitting layer/blocking layer/electron transport layer/cathode
    • anode/hole injection layer/hole transport layer/light-emitting layer/electron transport layer/cathode

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