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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

The order parameter of the light-emitting material in the light-emitting layer in the present invention is at least 0.7. With regard to the order parameter of the light-emitting material in the light-emitting layer, for example, a washed quartz substrate is put in a vapor deposition device, a film is produced by vapor-depositing a material containing the light-emitting material, and the order parameter of the light-emitting material can be calculated by the aforementioned deflection measurement of ATR-IR, deflection measurement of photoluminescence, or another such method. A state in which the order parameter measured by a method such as these is at least 0.7 refers to a state in which the long-axis direction of the light-emitting material in the light-emitting layer and the direction of the horizontal plane of the substrate substantially coincide, or in the case of a planar light-emitting material, a state in which the plane of the light-emitting material and the direction of the horizontal plane of the substrate substantially coincide (that is, a state in which “the light-emitting material is oriented in the horizontal direction with the substrate”), and this significantly reduces the proportion of the emission of a component that undergoes quenching by metals when the element is used for organic electroluminescence.

The order parameter of the light-emitting material in the light-emitting layer in the present invention is preferably at least 0.7 and no more than 1.0, and more preferably at least 0.8 and no more than 1.0.

權(quán)利要求

1
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