| abstract |
PROBLEM TO BE SOLVED: To improve the drive life of an organic electroluminescent element and suppress an increase in drive voltage. As a charge transporting material, a material having an oxidation potential of +0.8 V or more and a group content represented by the following formula of 0 to 70 ppm is used. However, the group is directly bonded to at least one aryl group, heteroaryl group or carbonyl group. Further, the carbon atom of the group is not a carbon atom constituting an aromatic ring. [Selection figure] None |