Cesium manganese halide perovskite-analogue nanocrystals with highly efficient energy conversion for flexible multifunctional fibers

In recent years, all-inorganic perovskite materials have been considered and applied in various fields. In this work, we used an improved method to synthesize novel zero-dimensional (0D) lead-free Cs 2 Mn(Cl/Br) 4 ·2H 2 O perovskite-analogue nanocrystals (PA NCs) under aerobic conditions. At the same time, lead (Pb) was introduced into manganese (Mn) halide perovskite-analogue nanocrystals of Cs 2 Mn(Cl/Br) 4 ·2H 2 O via a hot-injection method. The PA NCs shows an intense orange light under a UV lamp. The fluorescence spectrum peak center of the PA NCs is located at around 598 nm, and the photoluminescence quantum yield (PLQY) is 41.12%. The PLQY of the original PA NCs was almost nonexistent at around 598 nm. The increase in PLQY was due to the replacement of Mn 2+ with Pb 2+ , which effectively promotes the transfer of excitation energy to Mn 2+ . The Pb 2+ -doped Cs 2 Mn(Cl/Br) 4 ·2H 2 O PA NCs also exhibit excellent stability and strong PL. We also applied the PA NCs to composite paper. The properties described in this study provide new design ideas and directions for potential optronic devices. Pb 2+ -doped Cs 2 Mn(Cl/Br) 4 ·2H 2 O PA NCs exhibit excellent luminescence properties and stability, and can be used in fibers and other uses.