Organic/inorganic hybrid lead halide perovskites are promising optoelectronic materials due to their unique structure, excellent properties, and fascinating potential applications in lighting, photovoltaic, etc. However, perovskite materials are very sensitive to moisture and polar solvent, which greatly hinders their practical applications. Here, highly luminescent perovskite–polystyrene composite beads with uniform morphology are prepared via a simple swelling–shrinking strategy. This process is carried out only in nonpolar toluene and hexane without the addition of any polar reagents. As a result, the as‐prepared composite beads not only retain high luminescence but also exhibit superior water‐resistant property. The composites emit strong luminescence after being immersed into water over nine months. Moreover, even in some harsh environments such as acid/alkali aqueous solution, phosphate buffer solution, and Dulbecco's modified eagle medium biological buffers, they still preserve high luminescence. The applications in light‐emitting diodes and cellular labeling agents are also carried out to demonstrate their ultrastability.

中文翻译：

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通过溶胀收缩策略提高交联聚苯乙烯珠粒的稳定性，从而增强钙钛矿量子点的稳定性

有机/无机杂化卤化铅钙钛矿因其独特的结构，优异的性能以及在照明，光伏等领域的潜在应用而成为有前途的光电材料。然而，钙钛矿材料对水分和极性溶剂非常敏感，这极大地阻碍了它们的实际应用。在这里，通过简单的溶胀-收缩策略制备了具有均匀形态的高发光钙钛矿-聚苯乙烯复合材料珠。此过程仅在非极性甲苯和己烷中进行，而无需添加任何极性试剂。结果，所制备的复合材料珠不仅保留了高发光性能，而且还显示出优异的防水性能。浸入水中超过9个月后，复合材料会发出强烈的发光光。而且，即使在某些苛刻的环境中，例如酸/碱水溶液，磷酸盐缓冲溶液和Dulbecco改良的Eagle培养基生物缓冲液，它们仍然可以保持高发光度。还证明了它们在发光二极管和细胞标记剂中的超稳定性。