3, 6-diphenylcarbazole compound and organic electroluminescent device

An organic electroluminescent device comprising:

• an anode;
• a cathode which faces the anode;
• and
• at least one layer including a luminescent layer that comprises a phosphorescent dopant and is located between the anode and the cathode,
• wherein the at least one layer includes a 3,6-diphenylcarbazole compound represented by the following formula (II) that can serve as a host material for a guest material:
• wherein R1 and R2 are 4-phenyl groups, R5 represents a phenyl group or a biphenyl group substituted only with one or more groups selected from the group consisting of a hydrogen atom, an alkyl group, an alkoxy group and a combination thereof, and R3 and R4 independently represent a hydrogen atom or an unsubstituted aryl group,
• wherein the at least one layer includes a hole transporting layer, the luminescent layer, and an electron transporting layer, which are overlaid in this order.