All‐inorganic lead halide perovskite (IHP) nanocrystals (NC) have demonstrated to be a promising active material in a wide range of optoelectronic applications due to their chemical and thermal stability compared to organic‐inorganic perovskite NCs. However, the synthetic procedure of IHP NC generally requires a high‐temperature reaction of the precursors due to their limited solubility. Alternatively, the affinity of the precursor elements to the solvent was controlled to enhance their solubility in the liquid phase, and thus the enhanced kinetics in the crystallization process. Here, we show how the controlled solubility of Cs salts (i. e., Cs halide, acetate, carbonate) influences on their crystallization process and their optical properties. The formation of highly luminescent CsPbX₃ (X=Cl, Br, and mixed Br/Cl and Br/I) NCs with a well‐controlled crystallinity and morphology provide fundamental insights into their crystallization process, broadening their applications in the optoelectronic devices.

中文翻译：

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溶解度控制的室温合成卤化铯铅钙钛矿纳米晶体

与有机-无机钙钛矿NC相比，由于其化学和热稳定性，全无机卤化铅钙钛矿（IHP）纳米晶体（NC）已被证明是有前景的活性材料。但是，由于前驱物的溶解度有限，因此IHP NC的合成程序通常需要对其进行高温反应。或者，控制前体元素对溶剂的亲和力以增强其在液相中的溶解度，从而增强结晶过程中的动力学。在这里，我们显示了Cs盐（即Cs卤化物，乙酸盐，碳酸盐）的受控溶解度如何影响它们的结晶过程和它们的光学性能。高发光CsPbX ₃的形成 （X = Cl，Br以及混合的Br / Cl和Br / I）具有良好控制的结晶度和形态的NCs提供了对其结晶过程的基本了解，从而拓宽了其在光电器件中的应用范围。