Cesium lead halide perovskite (CsPbX₃, X=Cl, Br, I) nanocrystals embedded in Cs₄PbX₆ or CsPb₂X₅ matrices have received interests due to their excellent optical properties. However, their precise endotaxial structures are not known, and the origin of photoluminescence remains controversial. Here we report a sonochemistry technique that allowed us to synthesize high-quality CsPbBr₃-based microcrystals in all ternary phases, simply by adjusting precursor concentrations in a polar aprotic solvent, N,N-dimethylformamide. The microcrystals with diverse morphologies enabled us to visualize the lattice alignments in the dual-phase composites and confirm CsPbBr₃ nanocrystals being the photoluminescent sites. We demonstrate high solid-state quantum yield of >40% in Cs₄PbBr₆/CsPbBr₃ and lasing of CsPbBr₃ microcrystals as small as 2 µm in size. Real-time optical analysis of the reaction solutions provides insights into the formation and phase transformation of different CsPbBr₃-based microcrystals.

嵌入 Cs ₄ PbX ₆或 CsPb ₂ X ₅基质中的铯卤化铅钙钛矿 (CsPbX ₃ , X=Cl, Br, I) 纳米晶体因其优异的光学性能而受到关注。然而，它们精确的轴内结构尚不清楚，光致发光的起源仍存在争议。在这里，我们报告了一种声化学技术，该技术使我们能够在所有三元相中合成高质量的基于 CsPbBr ₃的微晶，只需调整极性非质子溶剂 N,N-二甲基甲酰胺中的前体浓度即可。具有不同形态的微晶使我们能够可视化双相复合材料中的晶格排列并确认 CsPbBr ₃纳米晶体是光致发光位点。_{我们展示了 Cs 4} PbBr ₆ /CsPbBr ₃中 >40% 的高固态量子产率以及尺寸小至 2 µm的 CsPbBr ₃微晶的激光发射。反应溶液的实时光学分析提供了对不同 CsPbBr ₃基微晶的形成和相变的深入了解。