Cesium lead halide perovskite nanocrystals (CLHP NCs) have drawn considerable attention because of their promising optoelectrical properties. However, owing to extreme vulnerability of CLHP NCs to water and polar alcohols, up to date, most of the synthesis approaches have inevitably adopted eco-unfriendly solvents. It is still a big challenge to employ green polar alcohol (ethanol) as a solvent to synthesize CLHP NCs. In this work, we realized a room-temperature in situ synthesis of CsPbBr₃/SiO₂ sol entirely in ethanol by innovatively constructing amine-functionalized silica micelles, which is originated from the synergistic effect of 3-aminopropyltriethoxysilane and tetraethyl orthosilicate (TEOS) during an acid-catalyzed sol–gel process. The sol exhibited high stability and an absolute photoluminescence quantum yield of 61.9% in ethanol without a further modification process. The light emitting intensity of the sol preserved for 34 days merely declined to 62.1%. This work sheds light on the less common strategy of directly synthesizing CsPbBr₃ NCs and long-term stable preservation in a strong polar solvent.

中文翻译：

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通过胺功能化二氧化硅胶束的室温全合成乙醇，高效原位合成CsPbBr ₃ / SiO ₂溶胶

卤化铯铅钙钛矿纳米晶体（CLHP NCs）由于其有希望的光电性能而备受关注。但是，由于CLHP NCs对水和极性醇的极端脆弱性，迄今为止，大多数合成方法不可避免地采用了对生态不利的溶剂。使用绿色极性醇（乙醇）作为溶剂来合成CLHP NCs仍然是一个很大的挑战。在这项工作中，我们实现了CsPbBr ₃ / SiO ₂的室温原位合成。通过创新性地构建胺官能化的二氧化硅胶束完全溶解在乙醇中，这是由于3-氨丙基三乙氧基硅烷和原硅酸四乙酯（TEOS）在酸催化的溶胶-凝胶过程中的协同作用而产生的。该溶胶在乙醇中无需进一步改性即可表现出高稳定性和61.9％的绝对光致发光量子产率。保存了34天的溶胶的发光强度仅下降到62.1％。这项工作揭示了直接合成CsPbBr ₃ NC和在强极性溶剂中长期稳定保存的较不普遍的策略。