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 (SiO₂), 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-SiO₂ 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-SiO₂ 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 SiO₂ encapsulation are highlighted and the design, synthesis, and performance improvement of current iodine-containing PNCs-SiO₂ 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.