White electroluminescence based on PFO:CdSe(ZnS):P3OT hybrid blends

White light emitting diodes (WOLEDs) were prepared from easily processable materials, well known in the literature (PFO and P3OT), with the intention of exploring the blueshift of the P3OT emission, when in low concentration, in blends with PFO in beta phase. The photoluminescence (PL) study, through donor excitation, of PFO:P3OT blends with different relative concentrations, served as basis for comparing and predicting the behavior of these blends when excited via carrier injection. Despite the good PL results, the white emission of the PFO:P3OT blends with low P3OT concentration was not replicable via electroluminescence (EL), due to the lack of a more intense green component. To circumvent this problem, new PFO:P3OT blends were prepared with the insertion of CdSe(ZnS) quantum dots (QDs), which have green emission. With this new composition, the devices presented white emission (0.33:0.33) at low voltages and current (8 V, 0.250 mA). For the PFO:CdSe(ZnS):P3OT devices, the change in the applied voltage also showed the possibility of tuning the emission of these structures. Therefore, this blend is very attractive to make solution processed, low cost, large area, and flexible lighting panels.