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

Abstract

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 Cs₂Mn(Cl/Br)₄·2H₂O perovskite-analogue nanocrystals (PA NCs) under aerobic conditions. At the same time, lead (Pb) was introduced into manganese (Mn) halide perovskite-analogue nanocrystals of Cs₂Mn(Cl/Br)₄·2H₂O 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 Mn²⁺ with Pb²⁺, which effectively promotes the transfer of excitation energy to Mn²⁺. The Pb²⁺-doped Cs₂Mn(Cl/Br)₄·2H₂O 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.