Influences of PEDOT: PSS on Properties in Organic Light-Emitting Diodes

In this paper, a set of organic light-emitting diodes were fabricated with the configuration of ITO/PEDOT: PSS/PVK: Ir(ppy)(3): PBD (40 nm)/BCP(8 nm)/Alq(3)(10 nm)/LiF(0.5 nm)/Al. The spin rate of PEDOT: PSS changed from 800 r/min to 2000 r/min, the annealed temperature of PEDOT: PSS changed from 80 degrees C to 180 degrees C and the annealed time of PEDOT: PSS changed from 0min to 15min. The Current density-voltage (J-V), Luminance-voltage (L-V) and Luminance efficiency-current density (LE-J) were studied. The electroluminescence (EL) spectra of these devices were measured. It was found that the device annealed PEDOT: PSS film at 150 degrees C for 5 min exhibits a better performance. The devices exhibit a maximum current density 410 mA.cm(-2) at 14V and a maximum luminous 3002.59cd.m(-2) at 13 V.