Efficient emission of quasi-two-dimensional perovskite films cast by inkjet printing for pixel-defined matrix light-emitting diodes

Abstract Quasi-two-dimensional (quasi-2D) perovskites are promising materials for potential application in light-emitting diodes (LEDs) due to their high exciton binding energy and efficient emission. However, their luminescent performance is limited by the low -n phases that act as quenching luminescence centers. Here, a novel strategy for eliminating low -n phases is proposed based on the doping of strontium bromide (SrBr 2 ) in perovskites, in which SrBr 2 is able to manipulate the growth of quasi-2D perovskites during their formation. It was reasonably inferred that SrBr 2 readily dissociated strontium ions (Sr 2+ ) in dimethyl sulfoxide solvent, and Sr 2+ was preferentially adsorbed around [PbBr 6 ] 4− through strong electrostatic interaction between them, leading to a controllable growth of quasi-2D perovskites by appropriately increasing the formation energy of perovskites. It has been experimentally proved that the growth can almost completely eliminate low -n phases of quasi-2D perovskite films, which exhibited remarkably enhanced photoluminescence. A high electroluminescent efficiency matrix green quasi-2D perovskite-LED (PeLED) with a pixel density of 120 pixels per inch fabricated by inkjet printing technique was achieved, exhibiting a peak external quantum efficiency of 13.9%, which is the most efficient matrix green quasi-2D PeLED so far to our knowledge.