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.