CsPbBr3 perovskite quantum dots-based Janus membrane with multifunction of luminescence, magnetism and aeolotropic electroconductivity

Lead halide perovskite quantum dots (QDs) are promising semiconductors for next -generation photoelectric devices. However, the development of perovskite QDs-based multifunctional materials still needs to be addressed in order to further advance the application of perovskite QDs. Herein, a successful synthesis of Janus microfibers array Janus membrane (JMAJM) with up -down structure and multifunction of luminescence, magnetism and electroconductivity is firstly achieved based on CsPbBr 3 QDs through a parallel electrospinning. JMAJM comprises up -down two layers tightly bonded together. The up -layer of JMAJM is luminescence/magnetism Janus microfibers array (L/M-JMAJM) constructed by [CsPbBr 3 /polymethyl methacrylate (PMMA)]//[CoFe 2 O 4 / PMMA] Janus microfibers as building elements. The down -layer of JMAJM is luminescence/electroconductivity Janus microfibers array (L/E-JMAJM) fabricated by [CsPbBr 3 /PMMA]//[polyaniline (PANI)/PMMA] Janus microfibers as building elements. Two independent microcosmic regions are designed and realized in a Janus microfiber, confining luminescence with magnetic or conductive substances into their respective regions, thus minimizing adverse effects of other dark -colored functional substances on the fluorescence of CsPbBr 3 QDs. This peculiar Janus microfiber enables the effective separation and high integration of CsPbBr 3 QDs with other functional substances. The up -down structure of JMAJM ensures a high integration of luminescence, magnetism and conductivity. Meanwhile, JMAJM addresses the environmental instability of CsPbBr 3 QDs while simultaneously endows perovskite QDs-based materials with additional functions to realize multifunction. Under ultraviolet excitation, fluorescence characteristics of the CsPbBr 3 QDs in JMAJM are maintained, exhibiting a vibrant green emission at 517 nm. Meanwhile, JMAJM achieves a maximum saturation magnetization of 20.32 emu & sdot;g - 1 micro -partition with macro -partition in JMAJM receives superior concurrent luminescence -magnetic -conductive multifunction. This work provides a novel idea and strategy for advancing perovskite QDs-based multifunctional materials. , high conductance of 10 -2 S and aeolotropic electroconductivity degree of 10 7 . The combination of micro -partition with macro -partition in JMAJM receives superior concurrent luminescence -magnetic -conductive multifunction. This work provides a novel idea and strategy for advancing perovskite QDs-based multifunctional materials.