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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

說明書

There are no particular restrictions on the thickness of the light-emitting layer, but in general, it is preferably from 2 to 500 nm, and from the standpoint of external quantum efficiency, it is more preferably from 3 to 200 nm and even more preferably from 5 to 100 nm.

The light-emitting layer in the element of the present invention may be constituted solely from a light-emitting material or may also be made up of a mixed layer of a host material and a light-emitting material. There may be just one type of light-emitting material, or two or more types may be used. The host material is preferably a charge transport material. There may be just one type of host material, or two or more types may be used, examples of which include a mixed configuration of an electron transporting host material and a hole transporting host material.

Furthermore, a material which does not have a charge transporting property and does not emit light may also be included in the light-emitting layer.

Moreover, the light-emitting layer may be a single layer or a multilayer of two or more layers, and each of the light-emitting layers may also emit light of a different color.

In addition, in the light-emitting layer, it is also preferable for a host material or the like other than the light-emitting material to be a planar material.

The amount of the light-emitting material contained in the light-emitting layer of the present invention is preferably 0.1 to 30 wt %, more preferably 1 to 25 wt %, and especially preferably 5 to 20 wt %.

<Host Material>

權(quán)利要求

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