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

專(zhuān)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(lèi)
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)

R7 and R8 are preferably an alkyl group or an aryl group.

r, s, t, and u represent each independently an integer from 0 to 3. Of these, r is preferably from 0 to 2 and more preferably 0 or 1. s is preferably from 0 to 2 and more preferably 0 or 1. t is preferably 0 or 1, and u is preferably 0 or 1.

If r, s, t, and u are 2 or greater, respectively adjacent ones of the plurality of R5 to R8 [groups] may be linked to each other to form a cyclic structure. Examples of this cyclic structure include structures in which a benzene ring, a benzofuran ring, a six-membered ring having Z, a fluorene ring, or the like is formed.

W1 and W2 represent a C1 to C10 alkyl group and may bond to each other to form a cyclic structure.

Examples of the alkyl group represented by W1 and W2 include a methyl group, an ethyl group, an n-propyl group, an n-butyl group, and a pentyl group, with a methyl group being preferable.

Moreover, an example of the cyclic structure formed by the bonding of W1 and W2 is a cyclohexyl ring structure.

From the standpoint of high aspect ratio, it is preferable if W1 and W2 are a methyl group or bond to each other to form a cyclohexyl ring structure.

Another one of the more preferred modes of the platinum complex expressed by General Formula C-1 is a platinum complex expressed by General Formula C-7 below:

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權(quán)利要求

1
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