Generative Synthesis of Highly Stable Perovskite Nanocrystals via Mesoporous Silica for Full‐Spectrum White LED

Abstract Perovskite nanocrystals with CsPbX ₃ (X = Cl, Br, or I) structure have attracted great attention for developing optoelectronic applications in the past few years. However, their low stability and the limited scalability of current synthesis methods pose major challenges for future applications. Here, a template‐assisted strategy is reported for synthesizing CsPbCl ₃ nanocrystals within mesoporous silica nanoreactors. Powder state CsPbCl ₃ complex fabricated via this method demonstrated an exceptional solvent stability and allows for yttrium doping to further enhance optical performance. Halide tuning (Cl⁻ to Br⁻) and synthesis of lead‐free perovskites such as Cs ₄ Bi ₂ MnCl ₁₂ enable broad spectral emission, supporting full‐spectrum white LED fabrication. This low‐cost, scalable, and reproducible method offers strong potential for advancing perovskite‐based optoelectronic technologies.