Stable and Bright Pyridine Manganese Halides for Efficient White Light-Emitting Diodes

Highly efficient lead halide perovskites with tunable emission performance have become new candidate materials for light-emitting devices and displays; however, the toxicity of lead and instability of halide perovskites greatly limits their application. Herein, rapid and large-scale synthesis of highly emissive organic–inorganic manganese halide perovskites, (C 5 H 6 N) 2 MnBr 4 and C 5 H 6 NMnCl 3 , are presented by a one-pot solution-based method, of which (C 5 H 6 N) 2 MnBr 4 displays a high absolute photoluminescence quantum yield (95%) in the solid-state. The developed (C 5 H 6 N) 2 MnBr 4 perovskite noticeably exhibits high stability. Therefore both as-synthesized green and red emissive manganese-based phosphors with superior optical properties are used to fabricate blue light pumped white light-emitting diodes (WLEDs), displaying excellent quality white light with a high color rendering index value of 91 and a correlated color temperature of 5331 K. This study not only presents the robust large-scale production synthetic approach for organic–inorganic manganese halide perovskites, but also facilitates the development of high-performance phosphors for future lighting and display technologies.