| abstract |
An organic multilayer electroluminescent device including an anode (20) and cathode (60), and including therebetween a hole transport layer (30); and an electron transport layer (40) disposed in operative relationship with the hole transport layer; wherein the hole transport layer includes an organic compound having the formula:n nwherein: nsubstituents R 1 , R 2 , R 3 and R 4 are each individually hydrogen, or alkyl of from 1 to 24 carbon atoms; aryl or substituted aryl of from 5 to 20 carbon atoms; or heteroaryl or substituted heteroaryl of from 5 to 24 carbon atoms; or fluorine, chlorine, bromine; or cyano group. |