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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
US11177450B2
公開日期
2021-11-16
申請人
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

說明書

The structures of materials other than the aforementioned ones given in Table 2 will be shown below:

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As can be seen from the results in Table 2, a comparison of Working Examples 1 to 3 and Comparative Examples 1 to 3, in which the order parameter (degree of orientation (S)) is the same, reveals that the external quantum efficiency and the power efficiency were better in Working Examples 1 to 3, in which the relationships 1.1<T1/T2<4.0 and also T2<80 nm were satisfied, than in Comparative Examples to 1 to 3. Moreover, as can be seen from Comparative Examples 4 and 5 and Comparative Examples 6 and 7, when the order parameter (degree of orientation (S)) was less than 0.7, the external quantum efficiency and the power efficiency in Comparative Examples 4 and 6, in which the relationship 1.1<T1/T2<4.0 was satisfied, tended to be the same as or inferior to those in Comparative Examples 5 and 7, in which this relationship was not satisfied.

As was described above, it can be seen that with the working examples of the present invention, in which the order parameter (degree of orientation (S)) is at least 0.7, and the relationships 1.1<T1/T2<4.0 and also T2<80 nm are satisfied, it is possible to satisfy both high external quantum efficiency and high power efficiency at the same time.

Working Example 4

權(quán)利要求

1
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