The potential optoelectronic applications of perovskite nanocrystals (NCs) are primarily limited by major material instability arising from the ionic nature of the NC lattice. Herein, we introduce a facile and effective strategy to prepare extremely stable CsPbX₃ NC–polymer composites. NC surfaces are passivated with reactive methacrylic acid (MA) ligands, resulting in the formation of homogeneous nanocubes (abbreviated as MA-NCs) with a size of 14–17 nm and a photoluminescence quantum yield above 80%. The free double bonds on the surface then serve as chemically addressable synthetic handles, enabling UV-induced radical polymerization. Critically, a bromide-rich environment is developed to prevent NC sintering. The composites obtained from copolymerizing MA-NCs with hydrophobic methyl methacrylate and methacrylisobutyl polyhedral oligomeric silsesquioxane monomers exhibit enhanced properties compared to previously reported encapsulated NCs, including higher quantum yields, remarkable chemical stability toward water, and much enhanced thermal stability. The good solubility of the composite in organic solvent further enables its use as a solution-processable luminescent ink, used here for fabrication of white-light-emitting diodes with high luminous efficiency and excellent color-rendering index. The resulting fluorescent and stable NC ink opens the door to potential scalable and robust optoelectronic applications.

中文翻译：

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使用可化学寻址的CsPbX ₃钙长石纳米晶制备稳定的发光纳米复合油墨的一般策略

钙钛矿纳米晶体（NCs）的潜在光电应用主要受到NC晶格的离子性质引起的主要材料不稳定性的限制。在此，我们介绍一种简便有效的策略来制备极其稳定的CsPbX ₃NC-聚合物复合材料。NC表面用反应性甲基丙烯酸（MA）配体钝化，形成大小为14-17 nm的均匀纳米立方体（缩写为MA-NC），光致发光量子产率超过80％。然后，表面上的游离双键可作为化学可寻址的合成手柄，从而实现UV诱导的自由基聚合。至关重要的是，开发了一种富含溴化物的环境来防止NC烧结。与先前报道的胶囊化NC相比，通过将MA-NC与疏水性甲基丙烯酸甲酯和甲基丙烯酸异丁基多面体低聚倍半硅氧烷单体共聚而获得的复合材料具有增强的性能，包括更高的量子产率，对水的显着化学稳定性以及大大提高的热稳定性。该复合物在有机溶剂中的良好溶解性进一步使其可用作溶液可加工的发光油墨，在此用于制造具有高发光效率和优异的显色指数的白光发光二极管。由此产生的荧光和稳定的NC墨水为潜在的可扩展和强大的光电应用打开了大门。