Patent ID: 6285039
Filing Date: 2001-09-04
Classification: C09K,H01L,H05B

Abstract:
An organic electroluminescent device comprisinga light emitting layer containing a coumarin derivative of the following formula (I), anda hole injecting and/or transporting layer containing a tetraaryldiamine derivative of the following formula (II), ##STR2129##wherein each of R.sub.1, R.sub.2, and R.sub.3, which maybe identical or different, is a hydrogen atom, cyano, carboxyl, alkyl, aryl, acyl, ester or heterocyclic group, or R.sub.1 to R.sub.3, taken together, may form a ring; each of R.sub.4 and R.sub.7 is a hydrogen atom, alkyl or aryl group; each of R.sub.5 and R.sub.6 is an alkyl or aryl group; or R.sub.4 and R.sub.5, R.sub.5 and R.sub.6, and R.sub.6 and R.sub.7, taken together, may form a ring, and ##STR2130##wherein each of Ar.sub.1, Ar.sub.2, Ar.sub.3, and Ar.sub.4 is an aryl group, at least one of Ar.sub.1 to Ar.sub.4 is a polycyclic aryl group derived from a fused ring or ring cluster having at least two benzene rings; each of R.sub.11 and R.sub.12 is an alkyl group; each of p and q is 0 or an integer of 1 to 4; each of R.sub.13 and R.sub.14 is an aryl group; and each of r and s is 0 or an integer of 1 to 5.