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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

Any light-emitting material publicly known in the past can be used as the light-emitting material in the present invention so long as it is oriented horizontally with the substrate in the light-emitting layer and the order parameter is at least 0.7, but from the standpoint of improving the orientation of the light-emitting material, the aspect ratio (molecular length/molecular thickness) is preferably greater than 3, more preferably greater than 5, and even more preferably greater than 5 and no more than 30, with 5.3 to 20 being especially favorable.

If the aforementioned aspect ratio is greater than 3, there will be little molecular fluctuation, and the decrease in orientation will be suppressed.

Note that in the present invention, the “molecular length” of the host material (described later) and the light-emitting material means the average values ((a+b)/2) of the lengths a and b of two sides of the closest quadrangle when the molecule of the material is imagined to have a flat structure as shown in FIG. 4. The term “closest quadrangle” here is defined as a quadrangle when the average values of a and b ((a+b)/2) are at their minimum out of a quadrangle (rectangle or square) that is tangent to the molecule on two sides. This “molecular length” is stipulated as follows by the theoretical calculation: Specifically, a density functional method is used, and in concrete terms, [this length is found] by using Gaussian 03 (from the US firm of Gaussian) to perform structural optimization computation with a basis function of 6-31G* and an exchange-correlation functional of B3LYP/LANL2DZ. The optimized structure obtained by structural optimization computation is used to define the molecular length as the average length of two sides of the closest quadrangle in ball-and-stick display.

權(quán)利要求

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