Nippon Steel Chemical Co., Ltd.

Sadao Kamimura

Toshihiro Yamamoto

Yu Yamada

Hiroshi Miyazaki

Daisuke Suzaki

Osamu Yoshitake

Provided is an organic electroluminescent device which is suitable for use in full-color and multicolor panels and shows higher luminous efficiency and better driving stability than organic electroluminescent devices utilizing luminescence from the singlet state. The organic electroluminescent device comprises a substrateand an anode, organic layers, and a cathodepiled one upon another on the substrate, at least one of the organic layers comprises a light-emitting layercontaining a host material and a dopant material, and a compound having 2 to 4 pyrazole structures represented by the following formula I (wherein Arto Arare independently hydrogen or substituted or unsubstituted aromatic hydrocarbon groups or aromatic heterocyclic groups) is used as said host material.

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Kagawa, Japan

Sadao Kamimura