Characteristics of co-doped device with hole and electron transport material
We demonstrated green organic lighte-emittin diodes (OLEDs) improved by co-doped using hole transport material, N′-bis-(1-naphyl)-N,N′-diphenyl-1,1′-biphenyl-4,4′-diamine (NPB) and electron transport material, bis(2-methyl-8-quninolinato)-4-phenylphenolate aluminum (Balq), into emitting layer. The co-doped materials impove charge blance by injecting hole [...]