Guo Yanmei, Chen Jinxi, Zhao Yixin, Lou Yongbing
School of Chemistry and Chemical Engineering, Southeast University, Nanjing, Jiangsu, 211189, P.R. China.
School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, P.R. China.
ChemSusChem. 2022 Aug 19;15(16):e202200793. doi: 10.1002/cssc.202200793. Epub 2022 Jul 5.
All-inorganic metal halide perovskite quantum dots (QDs) have attracted attention from researchers with their fascinating optoelectronic properties. However, blue-emitting perovskite QDs typically have low photoluminescence quantum yield (PLQY). For potential commercial applications, it is preferable to replace Pb with an element having low toxicity. Here, Pb-free Cs Bi Br @BiOBr perovskite QDs were anchored on the surface of NH -rich monodisperse silica (A-SiO ) via N-Bi chemical bonding to isolate QDs from each other, thus enhancing efficient surface passivation and suppressing optical decay. Compared to unanchored QDs, Cs Bi Br @BiOBr QDs/A-SiO composites exhibited significantly enhanced blue emission performance, the PLQY of which increased from 16.62 % to 77.26 %, in addition to good water and environmental stability. Finally, the novel composites as photocatalysts were used to drive the oxidation of toluene, a template reaction of C(sp )-H bond activation and demonstrated astonishing conversion rates (4317 μmol g h ) with high selectivity (around 87 %).
全无机金属卤化物钙钛矿量子点（QDs）凭借其迷人的光电特性吸引了研究人员的关注。然而，发射蓝光的钙钛矿量子点通常具有较低的光致发光量子产率（PLQY）。对于潜在的商业应用而言，用低毒性元素替代铅是较为可取的。在此，通过N-Bi化学键合将无铅的CsBiBr@BiOBr钙钛矿量子点锚定在富含NH的单分散二氧化硅（A-SiO）表面，以使量子点彼此隔离，从而增强有效的表面钝化并抑制光衰减。与未锚定的量子点相比，CsBiBr@BiOBr量子点/A-SiO复合材料表现出显著增强的蓝光发射性能，其PLQY从16.62%提高到77.26%，此外还具有良好的水稳定性和环境稳定性。最后，这种新型复合材料作为光催化剂用于驱动甲苯的氧化反应，这是C(sp³)-H键活化的模板反应，并展示出惊人的转化率（4317 μmol g⁻¹ h⁻¹）和高选择性（约87%）。
