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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

CROSS-REFERENCE TO RELATED APPLICATIONS

The present U.S. patent application is a U.S. National Stage Entry of international application number PCT/JP2012/059578, filed 6 Apr. 2012, which international application claims priority benefit from Japanese Patent Application Nos. 2012-054390, filed 12 Mar. 2012 and 2011-088682, filed 12 Apr. 2011, all of which are incorporated herein by reference in their entireties.

TECHNICAL FIELD

The present invention relates to an organoelectroluminescent element and to a light emission device, a display device, and an illumination device in which this organoelectroluminescent element is used.

BACKGROUND ART

Organoelectroluminescent elements are a self-emitting type of display device and are used in display and lighting applications. A display featuring an organoelectroluminescent element has advantageous display performance in that its visibility is better than that of conventional CRTs or LCDs, and that it has lower dependence on the viewing angle. Another advantage is that the display can be made more lightweight and thinner.

In addition to the advantages of light weight and thinness, an organoelectroluminescent element offers the potential to use a flexible substrate to achieve lighting in shapes that could not be obtained up to now.

權(quán)利要求

1
The invention claimed is:1. An organoelectroluminescent element 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 said anode side, whereinsaid light-emitting layer contains a single light-emitting material that is oriented in a horizontal direction with the substrate, the order parameter of said light-emitting material in said light-emitting layer is at least 0.7,wherein said light-emitting material has a structure of Formula 1:embedded imageand said light-emitting layer further contains a single host material having a structure of Formula 2:embedded imagethe relationship between thickness T1 (nm) of said first intermediate organic layer and thickness T2 (nm) of said second intermediate organic layer is such that 1.2<T1/T2<2.8 and also such that T1 is 48 nm to 11 Onm and T2 is 35 nm to 40 nm; and wherein the organoelectroluminescent element does not comprise a fluorescent light emitting material.2. A device comprising the organoelectroluminescent element according to claim 1, wherein the device is a light emission device, a display device or an illumination device.
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