Organic light emitting diodes using magnesium doped organic acceptor as electron injection layer and silver as cathode

Organic light emitting diodes employing magnesium doped electronacceptor 3, 4, 9, 10 perylenetetracarboxylic dianhydride(Mg:PTCDA) as electron injection layer and silver as cathode weredemonstrated. As compared to Mg:Ag cathode, the combination ofthe Mg:PTCDA layer and silver provided enhanced electroninjection into tris (8-quinolinolato) aluminium. The device with1:2 Mg:PTCDA and Ag showed an increase of about 12% in themaximum current efficiency, mainly due to the improved hole-electronbalance, and an increase of about 28% in the maximum powerefficiency, as compared to the control device using Mg:Agcathode. The properties of Mg:PTCDA composites were studied aswell.