Patent ID: 8541111

Claim:
A red light-emitting organic electroluminescent device comprising: an anode; a cathode; an organic layer which includes a light-emitting layer and is interposed between the anode and cathode, the light-emitting layer including a red light-emitting guest material and a host material composed of a polycyclic aromatic hydrocarbon compound with a mother skeleton having a ring member number of from four to seven; and an electron transport layer including a benzimidazole derivative represented by the following general formula (1) provided adjacent to the light-emitting layer wherein A 1 represents a hydrogen atom, a substituted or unsubstituted aryl group having not more than sixty carbon atoms, a substituted or unsubstituted heterocyclic group, a substituted or unsubstituted alkyl group having from one to twenty carbon atoms or an alkoxy group having from one to twenty carbon atoms; A 2 represents a hydrogen atom, an unsubstituted aryl group having not more than sixty carbon atoms, an unsubstituted heterocyclic group, an unsubstituted alkyl group having from one to twenty carbon atoms or an alkoxy group having from one to twenty carbon atoms; B represents a substituted or unsubstituted arylene group having not more than sixty carbon atoms, a pyridinylene group which may have a substituted or unsubstituted group, a quinolinylene group which may have a substituent or a fluorenylene group which may have a substituent; and Ar represents a substituted or unsubstituted alkyl group having from one to twenty carbon atoms or a substituted or unsubstituted alkoxy group having from one to twenty carbon atoms.