ORGANIC ELECTROLUMINESCENT DEVICE

摘要

An organic electroluminescent device which comprises a cathode, an anode, and an organic thin film layer disposed between the electrodes and composed of one or more layers, wherein the organic thin film layer includes at least one luminescent layer and at least one of the luminescent layer(s) comprises a host material represented by the following formula (1) and at least one phosphorescent material. Ra-Ar1-Ar2-Ar3-Rb (1) (In the formula (1), Ra, Rb, Ar1, Ar2, and Ar3 each represents an (un)substituted benzene ring or a fused aromatic hydrocarbon ring selected among a naphthalene ring, chrysene ring, fluoranthene ring, triphenylene ring, phenanthrene ring, benzophenanthrene ring, dibenzophenanthrene ring, benzotriphenylene ring, benzo[b]fluoranthene ring, benzochrysene ring, and picene ring each optionally substituted, provided that when Ar2 is an (un)substituted benzene ring, (un)substituted 2,7-phenanthrenediyl group, or (un)substituted triphenylene ring, then [Ra-Ar1-] and [Rb-Ar3-] respectively are groups differing in structure from each other.)