| abstract |
The present invention provides an anode 10 and a cathode 70, a light emitting layer 40 made of at least an organic compound between the anode 10 and the cathode 70, the anode 10 and the light emitting layer 40 Layer having at least two layers in the hole injection / transport band between the light emitting layer 40 and the electron injection / transport band between the light emitting layer 40 and the cathode 70 and in the hole injection / transport band. The layer in contact with the light emitting layer 40 contains an aromatic amine derivative having a carbazole skeleton, and any layer other than the layer in contact with the light emitting layer 40 of the layer in the hole injection / transport zone is a thiophene derivative, a tricycle. At least one material selected from the group consisting of the above condensed aromatic derivatives, amine derivatives (except compounds represented by the following formula A), conductive polymers, CF x , CuPc, transition metal oxides, fullerenes and acceptor materials Contains, Group and the electron injection and the transport layer in the band provided an organic electroluminescent device containing a benzoimidazole derivative. <Formula A> |