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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
US11177450B2
公開日期
2021-11-16
申請人
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

Next, an intermediate layer with an average thickness of 1.6 μm was formed by coating the aforementioned reduced texture layer with an intermediate layer coating solution having the following composition:

—Intermediate Layer Coating Solution—

2.1 weight parts polyvinyl alcohol (PVA205 (saponification value of 88%), made by Kuraray), 0.95 weight part polyvinyl pyrrolidone (PVP, K-30; made by ISP Japan), 44 weight parts methanol, and 53 weight parts distilled water were mixed to prepare an intermediate layer coating solution.

<Formation of Microparticle Layer>

Next, a microparticle layer with an average thickness of 10 μm was formed by coating the intermediate layer with a microparticle layer composition 1 prepared as follows and drying [this coating]:

<<Microparticle Layer Composition 1>>

30 weight parts microparticle dispersion 1 and 8 weight parts propylene glycol monomethyl ether acetate (MMPG-Ac, made by Daicel Chemical) were mixed at a temperature of 24° C. (±2° C.) and stirred for 10 minutes at 150 rpm. Then, 53 weight parts methyl ethyl ketone, 5 weight parts binder C, 0.002 weight part hydroquinone monomethyl ether, 4.2 weight parts DPHA solution, 0.16 weight part 2,4-bis(trichloromethyl)-6-[4-(N,N-diethoxycarbonylmethyl)amino-3-bromophenyl]-s-triazine, and 0.044 weight part surfactant 1 were added in this order at a temperature of 25° C. (±2° C.), and [the system] was stirred for 30 minutes at 150 rpm at a temperature of 40° C. (±2° C.) to prepare a microparticle layer composition.

—Microparticle Dispersion 1—

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