Magnetic all-inorganic perovskite nanocrystals demonstrating well-defined hybrid structure and superhydrophobic behavior towards movable and stable photoluminescence

Abstract As an emerging light-harvesting and light-emitting materials, all-inorganic perovskite nanocrystals (AIPNCs) have attracted widespread attentions in optoelectronic materials and devices. However, great challenges exist for the fabrication of novel AIPNCs demonstrating magnetic properties. Here, magnetic AIPNCs (M-AIPNC) with well-defined hybrid nanostructures of Fe3O4@SiO2@AIPNC are proposed. The core-shell structured chemical encapsulation and the in-situ crystal growth are designed to fabricate the magnetic substrate of Fe3O4@SiO2 and to link the AIPNCs, respectively. The as-prepared M-AIPNCs display brilliant blue, green and red photoluminescence by adjusting the chemical compositions of AIPNCs. The M-AIPNCs also demonstrate enhanced water stability due to their surficial hydrophobicity. The photoluminescence of Fe3O4@SiO2@AIPNC in the heating process exhibits a power exponential temperature response, and can be recovered in the cooling process. Most importantly, the M-AIPNCs can realize the mobile photoluminescence driven by a remote magnetic field. The M-AIPNCs with multi-colored fluorescence, excellent fluorescence stability, reversible temperature response and non-contact motion control provide a brand-new strategy to create the next generation of intelligent optical materials.