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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

FIG. 1 shows an example of the configuration of the organoelectroluminescent element according to the present invention. The organoelectroluminescent element 10 according to the present invention shown in FIG. 1 is such that a light-emitting layer 6 is sandwiched between an anode 3 and a cathode 9 on a support substrate 2, and a light extraction layer 15 is formed on the side opposite from the side on which the anode 3 is formed. In concrete terms, a hole injection layer 4, a hole transport layer 5, the light-emitting layer 6, a first electron transport layer 7, and a second electron transport layer 8 are formed in this order between the anode 3 and the cathode 9.

In the configuration of the organoelectroluminescent element shown in FIG. 1, the first intermediate organic layer is composed of the hole injection layer 4 and the hole transport layer 5, and the thickness T1 of the first intermediate organic layer is the sum of the thickness of the hole injection layer 4 and the thickness of the hole transport layer 5. Similarly, the second intermediate organic layer is composed of the first electron transport layer 7 and the second electron transport layer 8, and the thickness T2 of the second intermediate organic layer is the sum of the thickness of the first electron transport layer 7 and the thickness of the second electron transport layer 8.

For the sake of the properties of a light-emitting element, the anode is preferably either transparent or semi-transparent.

<Layer Configuration of Organoelectroluminescent Element>

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