Cueto Christopher, Hu Weiguo, Ribbe Alexander, Bolduc Kimberly, Emrick Todd
Department of Polymer Science & Engineering, University of Massachusetts, Conte Center for Polymer Research, 120 Governors Dr, Amherst, MA 01003, USA.
Department of Chemistry, University of Massachusetts, Physical Sciences Building, 690 North Pleasant St, Amherst, MA 01003, USA.
Angew Chem Int Ed Engl. 2022 Sep 12;61(37):e202207126. doi: 10.1002/anie.202207126. Epub 2022 Aug 4.
Post-synthesis anion exchange of all-inorganic cesium lead halide perovskite nanocrystals (CsPbX NCs, where X=Cl, Br, and/or I) provides a rapid and simple means of tuning their band gap and photoluminescence emission wavelengths. Here we report color-shifting of CsPbX nanocrystals induced by a macromolecular source of halide ions, specifically using polystyrene with ammonium halides as pendent groups. This strategy for introducing new halides to the perovskite nanocrystals gave access to perovskite-polymer hybrid materials as solutions, thin films, or free-flowing powders. Spectroscopic measurements of the halide-exchanged nanocrystal products revealed high photoluminescence quantum yields across the visible spectrum, with exchange kinetics that were tunable based on the solution environment, suggesting an aggregation-inhibited exchange process that affords access to multi-colored solutions and films.
全无机铯铅卤化物钙钛矿纳米晶体（CsPbX NCs，其中X = Cl、Br和/或I）的合成后阴离子交换提供了一种快速且简单的方法来调节其带隙和光致发光发射波长。在此，我们报道了由卤离子的大分子源诱导的CsPbX纳米晶体的颜色变化，具体是使用带有卤化铵作为侧基的聚苯乙烯。这种将新卤化物引入钙钛矿纳米晶体的策略使得能够获得作为溶液、薄膜或自由流动粉末的钙钛矿-聚合物杂化材料。对卤化物交换的纳米晶体产物的光谱测量表明，在可见光谱范围内具有高光致发光量子产率，其交换动力学可根据溶液环境进行调节，这表明存在一种聚集抑制的交换过程，从而能够获得多色溶液和薄膜。
