Enhancing Quasi-2D Perovskite LEDs via Quantum Dot Integration for Brighter and More Stable Emission

Metal halide perovskite quantum dots (QDs) have drawn immense interest for LEDs due to their narrow emission, high photoluminescence quantum yield, and color tunability. Yet, blue quasi-2D perovskite LEDs (PLEDs) remain limited by low brightness and modest external quantum efficiency (EQE). Here, we employ solvent engineering to incorporate FA-doped CsPbBr₁.₅Cl₁.₅ QDs into quasi-2D emissive layers to enhance luminescence and film quality. As a proof of concept, we integrated CsPbBr₃ QDs into 3D CsPbBr₃ films for single-layer perovskite light-emitting electrochemical cells (PeLECs), achieving luminance improvements from only 1200 cd/m² for 3D only to over 3000 cd/m²  for 3D+QDs nanocomposite. Blue PQD incorporation improves radiative recombination via stronger quantum confinement, reduces nonradiative losses by covering pinholes, and enables more uniform charge transport in continuous matrix. This approach points toward brighter, more stable, and color-tunable perovskite LECs, while providing design insights for advancing blue quasi-2D PLEDs and PLECs.