Blue emitting materials containing dibenzo[b,d]furan and dibenzo[b,d]thiophene for organic light-emitting diodes

In this study, we designed and synthesized three blue emitting materials containing dibenzo[b,d]furan and dibenzo[b,d]thiophene. To investigate the electroluminescence (EL) properties, we fabricated devices with following sequences: indium-tin-oxide (180 nm)/N,N′-diphenyl-N,N′-(1-napthyl)-(1,1′-phenyl)-4,4′-diamine (50 nm)/blue emitters (30 nm)/bathophenanthroline (30 nm)/lithium quinolate (2 nm)/Al (100 nm). A device using 1,4-bis(dibenzo[b,d]furan-4-yl)naphthalene showed the deep-blue emission with 1.34% of external quantum efficiency at 30 mA/cm2. The Commission Internationale de l Eclairage (CIE) coordinates of this device was at 6.0 V.