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AssigneeNippon Steel & Sumikin Chemical Co., Ltd.
InventorsJunya Ogawa, Takahiro Kai, Toshihiro Yamamoto, Megumi Matsumoto
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Disclosed is an organic electroluminescent device (organic EL device) which is improved in luminous efficiency, sufficiently secures driving stability, and has a simple configuration. The organic EL device of this invention comprises a light-emitting layer between an anode and a cathode piled one upon another on a substrate wherein the light-emitting layer contains a phosphorescent dopant and a 1,9-substituted carbazole compound as a host material. An example of the 1,9-substituted carbazole compound is represented by the following general formula (1). In formula (1), Ar is an aromatic hydrocarbon group or aromatic heterocyclic group; L is an aromatic hydrocarbon group or aromatic heterocyclic group; each of R1 to R3 is a hydrogen atom, an alkyl group, a cycloalkyl group, an aromatic hydrocarbon group, or an aromatic heterocyclic group; n is an integer of 1 to 3.
An organic electroluminescent device comprising an anode, a plurality of organic layers, and a cathode piled one upon another on a substrate wherein the plurality of organic layers comprise an organic layer containing a carbazole compound having aromatic groups selected from aromatic hydrocarbon groups and aromatic heterocyclic groups, at least one of the said aromatic groups having a fused ring structure composed of two rings or more, as substituents at the 1 and 9 positions of the carbazole ring and having the total of 20 to 80 carbon atoms and the organic layer containing the carbazole compound is a light-emitting layer containing a phosphorescent dopant.
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Dependencies are inferred from the claim text.