Green Synthesis of Manganese-Based Anti-Perovskite with Anti-Thermal Quenching Properties for LED

Abstract

Due to their excellent properties, lead halide perovskites are promising candidates for future optical emitters. However, lead (Pb) toxicity in perovskite materials poses a critical concern for their commercial application in optoelectronic devices. Herein, we present a facile and environmentally friendly approach for synthesizing lead-free [MnBr 4 ]BrCs 3 perovskite materials. Our approach involves using a water-based evaporation crystallization technique to prepare [MnBr 4 ]BrCs 3 with an anti-perovskite structure. The anti-perovskite structure of the powder was confirmed through X-ray diffraction analysis.The prepared fluorescent powder exhibited strong green emission with a peak emission wavelength of 524 nm and an extremely narrow bandwidth (~41 nm). Excitonic properties studied by variable-temperature steady-state luminescence spectroscopy of [MnBr 4 ]BrCs 3 reveal notable thermal stability and anti-thermal quenching features, making them potential candidates for light-emitting diodes (LEDs). The origin of the effect was verified through magnetic characterization, variable temperature analysis, and first-principles calculation: the reduced ferromagnetic coupling between Mn-Mn. As proof, a UV-pumped LED based on the material was successfully prepared, exhibiting a high maximum brightness (257445 cd/m 2 ) and a long half-life (870 min). These findings have significant implications for developing efficient and environmentally friendly perovskite-based opto-electronics.