Cheng Jun, Yuan Shuanglong, Zhu Ludan, Chen Long, Liu Chuanqi, Tong Hua, Zeng Huidan
Institute of Inorganic Materials, East China University of Science and Technology, Shanghai 200237, China.
Langmuir. 2020 Apr 7;36(13):3565-3572. doi: 10.1021/acs.langmuir.0c00108. Epub 2020 Mar 30.
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 CsPbBr/SiO 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 CsPbBr NCs and long-term stable preservation in a strong polar solvent.
卤化铯铅钙钛矿纳米晶体（CLHP NCs）因其具有良好的光电性能而备受关注。然而，由于CLHP NCs对水和极性醇极其敏感，迄今为止，大多数合成方法不可避免地采用了对环境不友好的溶剂。使用绿色极性醇（乙醇）作为溶剂来合成CLHP NCs仍然是一个巨大的挑战。在这项工作中，我们通过创新地构建胺功能化二氧化硅胶束，实现了在乙醇中完全室温原位合成CsPbBr/SiO溶胶，这源于3-氨丙基三乙氧基硅烷和正硅酸四乙酯（TEOS）在酸催化溶胶-凝胶过程中的协同作用。该溶胶表现出高稳定性，在乙醇中绝对光致发光量子产率为61.9%，无需进一步改性处理。该溶胶的发光强度在34天内仅下降到62.1%。这项工作为直接合成CsPbBr NCs以及在强极性溶剂中长期稳定保存提供了一种不太常见的策略。
