| 摘要 |
An organic electroluminescent device ( 1 ) including an anode ( 2 ), a cathode ( 6 ), and at least a first layer ( 3 ), a second layer ( 4 ), and a third layer ( 5 ) provided between the anode ( 2 ) and the cathode ( 6 ) in that order from the anode side. At least one of the first to third layers ( 3 ), ( 4 ), and ( 5 ) includes a phosphorescent compound. At least one of the first to third layers ( 3 ), ( 4 ), and ( 5 ) is an emitting layer. At least three compounds respectively forming the first layer ( 3 ), the second layer ( 4 ), and the third layer ( 5 ) other than the phosphorescent compound are compounds of the following formula (1). wherein R<SUP>1 </SUP>to R<SUP>7 </SUP>each represent a hydrogen atom or a substituent, provided that adjacent substituents may form a ring.
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