Nippon Steel & Sumikin Chemical Co., Ltd.

Hideki Tanaka

Takahiro Kai

Toshihiro Yamamoto

Megumi Matsumoto

Mitsuru Suda

Provided is an organic electroluminescent device (organic EL device) that is improved in luminous efficiency, sufficiently secures driving stability, and has a simple construction. The organic electroluminescent device includes, between an anode and cathode laminated on a substrate, a plurality of organic layers. At least one layer of the organic layers contains a carbazole compound represented by the following general formula (1) having two to three structures in each of which a carbazole ring and a dibenzofuran or dibenzothiophene ring are bonded to each other at 1- and 4-positions. In the formula (1), A represents an n-valent aromatic hydrocarbon group or aromatic heterocyclic group, n represents an integer of 2 or 3, and X represents oxygen or sulfur.

Organic electroluminescent element

Disclosed is an organic electroluminescent device (organic EL device) which is improved in luminous efficiency, fully secured of high driving stability, and of a simple structure. The organic EL device is constituted of an anode, organic layers containing a phosphorescent light-emitting layer, and a cathode piled one upon another on a substrate and a phosphine oxide derivative represented by general formula (1) is contained in a phosphorescent light-emitting layer, an electron-transporting layer, a hole-blocking layer, or an exciton-blocking layer. In general formula (1), Lis a direct bond or an aromatic group with a valence of 1-3 and Aris an aromatic group. The two Argroups linked to the same nitrogen atom may form a nitrogen heterocycle and may further form a fused ring together with the said nitrogen heterocycle. 

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Kitakyushu, Japan

Hideki Tanaka