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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)

The aforementioned silyl group represents a silyl group which has been substituted with a C3 to C24 hydrocarbon group and may be a trialkylsilyl group, an aryldialkylsilyl group, an alkyldiarylsilyl group, or a triarylsilyl group. The aforementioned silyl group is preferably with a carbon number of 3 to 18, concrete examples of which include a trimethylsilyl group, a t-butyldimethylsilyl group, a triphenylsilyl group, and a t-butyldiphenylsilyl group.

Examples of the aforementioned heterocyclic group include a pyridine ring, a pyrimidine ring, a pyrazine ring, a pyridazine ring, a triazine ring, an imidazole ring, a pyrazole ring, an oxazole ring, a thiazole ring, a triazole ring, an oxadiazole ring, a thiadiazole ring, a thiophen ring, and a furan ring.

Of these, from the standpoint of aspect ratio, a linear alkyl group or, in the case of a group other than an alkyl group, having an alkyl group as a substituent is preferable.

In addition, R1 and R2 are [each] preferably an alkyl group, an aryl group, a fluorine atom, a cyano group, or a silyl group, and more preferably an alkyl group or an aryl group.

Furthermore, R3 and R4 are [each] preferably an alkyl group or an aryl group, more preferably a methyl group, a trifluoromethyl group, or a phenyl group, and even more preferably a methyl group or a trifluoromethyl group.

權(quán)利要求

1
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