Maximising OLED performance: Unleashing the power of stacking transport, injection and blocking layers along with different emissive materials

The performance of multilayer organic light emitting diode (OLED) is studied by stacking poly(3,4- ethylenedioxythiophene) polystyrene sulphonate (PEDOT:PSS) as the hole transport layer (HTL), tris(4- carbazoyl-9-ylphenyl) amine (TCTA) as the hole injection layer (HIL) and bathophenanthroline (BPhen) as the electron transport layer (ETL). Modification is done in the emissive layer (EML) by the introduction of host–guest material which is bis[2-(4,6-difluorophenyl) pyridinato-C2,N](picolinato)iridium(III) (FlrPic) and bis[2- (diphenylphosphino) phenyl] ether oxide (DPEPO). Multiple devices are fabricated and the performance is compared in terms of turn-on voltage, current density, brightness and luminous efficiency. The device with co-deposition of guest and host materials has improved the luminous efficiency by 6.17% when compared to the other fabricated devices. (author)