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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)

In addition, among planar host compounds, a compound that is in the form of a disk is preferable as the host material used in the light-emitting layer of the present invention, and a discotic liquid crystalline host compound corresponding to the following is more preferable:

Discotic Liquid Crystalline Host Compound

A discotic liquid crystalline host compound forms a liquid crystal phase composed of disk-shaped molecules having high planarity.

Discotic liquid crystalline host compounds also include compounds having a structure in which linear alkyl groups, alkoxy groups, or substituted benzoyloxy groups are substituted radially as side chains of the mother nucleus at the molecular center. The compound is preferably one in which the molecule or cluster of molecules has rotational symmetry, and a specific orientation can be imparted.

The discotic liquid crystalline host compound is preferably selected from among triphenylene derivatives, pyrene derivatives, triazine derivatives, and carbazole derivatives, and more preferably selected from among triphenylene derivatives, pyrene derivatives, and triazine derivatives, and is most preferably a triphenylene derivative.

Discotic Liquid Crystalline Triphenylene Derivative

Any conventionally known discotic liquid crystalline triphenylene derivative can be used as the triphenylene derivative that exhibits liquid crystallinity, but it may be, for example, a triphenylene derivative expressed by General Formula T-I below:

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權(quán)利要求

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