“…Metal halide perovskites (MHPs) are extensively used in light-emitting diodes, , solar cells, photodetectors, lasers, and other fields because of their excellent photoelectric properties. In recent years, polycation halide perovskites, such as MA/CsPb(Br/I) 3 , have been applied to red perovskite light-emitting diode (PeLED) materials. , These perovskites combine the advantages of organic and inorganic perovskites.…”