Organic–inorganic hybrid perovskite nanoparticles (NPs) are a very strong candidate emitter that can meet the high luminescence efficiency and high color standard of Rec.2020. However, the instability of perovskite NPs is the most critical unsolved problem that limits their practical application. Here, an extremely stable crosslinked perovskite NP (CPN) is reported that maintains high photoluminescence quantum yield for 1.5 years (>600 d) in air and in harsher liquid environments (e.g., in water, acid, or base solutions, and in various polar solvents), and for more than 100 d under 85 °C and 85% relative humidity without additional encapsulation. Unsaturated hydrocarbons in both the acid and base ligands of NPs are chemically crosslinked with a methacrylate‐functionalized matrix, which prevents decomposition of the perovskite crystals. Counterintuitively, water vapor permeating through the crosslinked matrix chemically passivates surface defects in the NPs and reduces nonradiative recombination. Green‐emitting and white‐emitting flexible large‐area displays are demonstrated, which are stable for >400 d in air and in water. The high stability of the CPN in water enables biocompatible cell proliferation which is usually impossible when toxic Pb elements are present. The stable materials design strategies provide a breakthrough toward commercialization of perovskite NPs in displays and bio‐related applications.

中文翻译：

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在严酷环境下1.5年以上的极其稳定的发光交联钙钛矿纳米颗粒

有机-无机杂化钙钛矿纳米颗粒（NPs）是非常强大的候选发射体，可以满足Rec.2020的高发光效率和高色标。然而，钙钛矿NP的不稳定性是最关键的未解决问题，限制了它们的实际应用。此处报道了一种极其稳定的交联钙钛矿NP（CPN），可在空气中以及在更恶劣的液体环境（例如水，酸或碱溶液以及各种极性环境）中维持1.5年（> 600 d）的高光致发光量子产率。溶剂），并在85°C和相对湿度85％的条件下放置100 d以上，而无需另外封装。NP的酸和碱配体中的不饱和烃与甲基丙烯酸酯官能化的基质化学交联，可防止钙钛矿晶体分解。与直觉相反，渗透通过交联基质的水蒸气化学钝化了NP中的表面缺陷，并减少了非辐射重组。演示了发绿光和发白光的柔性大面积显示器，它们在空气和水中> 400 d时都稳定。CPN在水中的高稳定性可实现生物相容性细胞增殖，而当存在有毒的Pb元素时，这通常是不可能的。稳定的材料设计策略为钙钛矿纳米颗粒在显示器和生物相关应用中的商业化提供了突破。在空气和水中400 d。CPN在水中的高稳定性可实现生物相容性细胞增殖，而当存在有毒的Pb元素时，这通常是不可能的。稳定的材料设计策略为钙钛矿纳米颗粒在显示器和生物相关应用中的商业化提供了突破。在空气和水中400 d。CPN在水中的高稳定性可实现生物相容性细胞增殖，而当存在有毒的Pb元素时，这通常是不可能的。稳定的材料设计策略为钙钛矿纳米颗粒在显示器和生物相关应用中的商业化提供了突破。