Silica‐Stabilized Lead Halide Perovskite Nanocrystals: Advantages, Progress, and Future Directions

Abstract Lead halide perovskite nanocrystals (PNCs) combine properties required by high‐quality light sources like high brightness, color purity, defects tolerance, and tunable emission wavelength. Notably, their nanoscale size enables integration or fabrication into micro/nano light‐emitting devices, which have significant market demand. However, the stability of PNCs remains an open issue for their industrialization. Chemically stable and transparent amorphous silica (SiO 2 ), an ideal cladding for vulnerable optical materials, is widely utilized to expand the applications of PNCs, resulting in many composites. Nevertheless, current composites remain far from achieving a sufficiently stable high‐quality luminescent unit, and the specific challenges in PNCs‐SiO 2 integration have not been clearly outlined. To provide inspiration for this field, iodine‐containing PNCs are used as a representative example to deliver a comprehensive review of PNCs‐SiO 2 development. First, the performance advantages, prospects, and stability challenges of PNCs are analyzed, with a focus on typical cesium lead iodine nanocrystals. Next, the benefits of SiO 2 encapsulation are highlighted and the design, synthesis, and performance improvement of current iodine‐containing PNCs‐SiO 2 composites are systematically summarized. Finally, optimism about the potential of single‐particle encapsulation technology for PNCs is expressed and the challenges and future directions in this field are outlined.