Hybrid OLEDs with CdSSe1–x/ZnS core–shell quantum dots: An investigation of electroluminescence properties

Abstract

In this publication we are presenting broad spectrum organic light emitting diodes with quantum dots (QD OLEDs) based on two emission layers: blue-green organic molecule emitter tris[2-(2,4-difluorophenyl)pyridine]iridium(III) (Ir(Fppy)3) and red CdSxSe1–x/ZnS core–shell QDs emitter. The performance of QD OLEDs was investigated for different CdSxSe1–x/ZnS QDs solution concentrations in toluene during the spin-coating process. The uniform distribution of QDs with controllable density was achieved using spin-coating method. The threshold concentration of QDs in toluene for the emission of QDs in QD OLEDs and concentration for the broad spectrum electroluminescence (EL) of QD OLED was found.