| abstract |
A diaminonaphthalene derivative of formula (1):n nwherein R 21 to R 30 independently and individually represent a hydrogen atom,na halogen atom, a C1-C6 alkyl group, a C1-C6 alkoxy group, a substituted ornunsubstituted amino group, a substituted or unsubstituted aryl group, or ansubstituted or unsubstituted heterocyclic group, the substituted ornunsubstituted aryl group or the substituted or unsubstituted heterocyclicngroup may be condensed with the corresponding benzene ring at an arbitrarynposition of the benzene ring; and each of X and Y represents a hydrogen atomnor a substituted or unsubstituted amino group, wherein at least one of the X ornY represents a substituted or unsubstituted amino group. The derivative isnincorporated into an organic electroluminescent device (organic EL device),nand serves as a hole-transportation layer, a luminescence layer, etc. Thenorganic EL device containing the derivative exhibits high luminous efficacynand a prolonged service life. |