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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

From the standpoint of the expression of an ND phase, RT is preferably RT2—O-Ph-COO—, RT2—(O—RT3)nT-O-Ph-COO—, or RT2—O-Ph-CH═CH—COO—, and more preferably RT2—O-Ph-COO—.

In terms of the expression of an ND phase, the triphenylene derivative expressed by General Formula T-I above is preferably a triphenylene derivative expressed by General Formula T-II below:

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In General Formula T-II above, RT′ represents RT2—O-Ph-CO—, RT2—(O—RT3)nT-O-Ph-CO—, or RT2—O-Ph-CH═CH—CO—. RT2, Ph, RT3, and nT are defined the same as RT2, Ph, RT3, and nT in General Formula T-I above. Furthermore, concrete examples and preferred ranges of RT2, Ph, RT3, and nT in General Formula T-II above are also the same as those in General Formula T-I above.

It is more preferable if RT′ is expressed by one of General Formulas T-II-1 to T-II-5 below because the expression of an ND phase will be better:

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權(quán)利要求

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