Substituent effects of 2,3-dicyano-5-[4-(diethylamino)styryl]-7-methyl-6H-1,4-diazepines on their use as red dopants in single-layer organic electroluminescence devices

摘要

6-Substituted 2,3-dicyano-5-[4-(diethylamino)styryl]-7-methyl-6H-1,4-diazepines were applied as red dopants in single-layer organic electroluminescence(EL)devices.EL maxima were observed at around 610 nm and the EL intensity of the 6-alkyl derivatives was higher than that of the unsubstituted variant under fixed bias voltage due to increased current density and improved eta_(ext)in the devices.