Synthesis of Gram-Scale Ultrastable Mn-Doped 2D Perovskites for Light-Emitting Diodes

Mn-doped 2D perovskites are emerging as good candidates for light-emitting applications due to their excellent optical and electrical properties. Major synthetic routes, solid-state grinding and high-temperature solution synthesis, are extensively studied to prepare Mn-doped 2D perovskites. However, complicated synthesis, small-scale yields, and poor-stability impede their widespread applications. Herein, a one-step acid-solution-assisted method is exhibited for gram-scale production of Mn-doped 2D (C 8 H 17 NH 2 ) 2 PbBr 4 with a solid yield of 1.35 g products out of 3 mL solvent. After Mn-doped 2D (C 8 H 17 NH 2 ) 2 PbBr 4 being stored in the air for 90 days, the photoluminescence (PL) quantum yield of powders has minor changes, showing good stability. Phosphor-converted monochrome light-emitting diodes (LEDs) are fabricated. After the LEDs work 6 h under a voltage of 3 V, their PL spectra have no obvious change, showing a great potential in optoelectronic devices. This study provides a new effective strategy for large-scale synthesis of ultrastable Mn-doped 2D perovskites, which is expected to provide inspiration for the industrial optoelectronic applications of perovskites.