Ion-Ligand Synergistic Strategy Enhancing Optical Performance of Perovskite Nanocrystals for Wide Color Gamut Display

Halide perovskite nanocrystals (NCs) are promising emitters for wide-color-gamut displays owing to their high color purity, yet their practical application is limited by ligand desorption-induced instability. Here, we develop a sequential ion-ligand synergistic passivation strategy to stabilize CsPbBr 3 NCs. Zn 2+ ions are introduced to compensate surface Pb vacancies, while thiol ligands further passivate undercoordinated Pb/Zn sites, thereby reducing surface defects and enhancing lattice stability. The resulting NCs exhibit a narrower emission spectra and high photoluminescence quantum yield of ∼95% together with significantly improved optical stability, demonstrating the advantages of sequential ion-ligand synergistic strategy. Further encapsulation into PMMA microspheres efficiently enhances environmental robustness of NCs, enabling a T 85 lifetime approximately sevenfold longer than that of pristine NCs under 85°C/85% RH conditions. The resultant white light-emitting diodes based on NCs microspheres achieve ∼121% of NTSC color gamut with a superior display performance and excellent long-term operation stability. Therefore, this work establishes a synergistic ion-ligand passivation strategy for stabilizing perovskite NCs and offers a design strategy for high-performance display applications.