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

Abstract

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 (C8H17NH2)2PbBr4 with a solid yield of 1.35 g products out of 3 mL solvent. After Mn‐doped 2D (C8H17NH2)2PbBr4 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.

The Effects of Mono- and Bivalent Linear Alkyl Interlayer Spacers on the Photobehavior of Mn(II)-Based Perovskites

“…The absence of fine and/or hyperfine structures and the Lorentzian shape of the curve indicate an exchange narrowing of the spectrum due to strong magnetic interactions that average the local fields around the Mn 2+ ions in this compound [ 47 , 48 ]. Similar spectra have been found in other hybrid perovskites with manganese in octahedral environments [ 49 , 50 ].…”

Emerging doping strategies in two-dimensional hybrid perovskite semiconductors for cutting edge optoelectronics applications

“…75 The synthesis method is extremely simple and cost-efficient as one only needs to mix the raw materials lead monoxide, hydrobromic acid, MnBr 2 , and octylamine, in an open-air atmosphere in a glass bottle and then put it in a vacuum oven at 100 C for 3 h to dry. 75 The XRD peaks in Mn-doped perovskites shied to lower angles with increasing Mn concentration in (C 8 H 17 NH 2 ) 2 PbBr 4 due to the increase in disorder between the organic layer, similar to Mn-doped (NMA) 2 PbX 4 and (BIZ) 2 PbI 4 perovskites. 69,71,75 The crystal structure and optical properties of the Mn-doped (C 8 -H 17 NH 2 ) 2 PbBr 4 perovskite were unchanged for 90 days under ambient conditions, implying its higher ambient stability.…”

“…69,71,75 The crystal structure and optical properties of the Mn-doped (C 8 -H 17 NH 2 ) 2 PbBr 4 perovskite were unchanged for 90 days under ambient conditions, implying its higher ambient stability. 75 Various pure and Mn-doped 2D organic-inorganic (OI) halide perovskites ((PEA) 2 PbBr 4 , (BAm) 2 PbBr 4 , and (BA) 2 PbBr 4 ) (BAm ¼ benzylamine) were synthesized through acid solutionassisted Lewis-base precipitation method, which improved the stability of the system compared to the Mn doped perovskites synthesized using other conventional methods (Fig. 5(d)).…”

“… 74 Gram-scale production of the Mn-doped 2D (C 8 H 17 NH 2 ) 2 PbBr 4 perovskite with a solid yield of 1.35 g products out of 3 mL solvent was recently reported by Li et al using a one-step acid solution-assisted method. 75 The synthesis method is extremely simple and cost-efficient as one only needs to mix the raw materials lead monoxide, hydrobromic acid, MnBr 2 , and octylamine, in an open-air atmosphere in a glass bottle and then put it in a vacuum oven at 100 °C for 3 h to dry. 75 The XRD peaks in Mn-doped perovskites shifted to lower angles with increasing Mn concentration in (C 8 H 17 NH 2 ) 2 PbBr 4 due to the increase in disorder between the organic layer, similar to Mn-doped (NMA) 2 PbX 4 and (BIZ) 2 PbI 4 perovskites.…”

Monochromatic light-enhanced photocatalytic CO2 reduction based on exciton properties of two-dimensional lead halide perovskites

“…The inorganic layers consisting of corner-sharing [PbX 6 ] 4− octahedra networked in two dimensions are separated by organic ligand layers, which are ∼0.6 nm in thickness. 62,68,69 Therefore, the organic layers occupy a space of ∼1.2 nm in height (Fig. 2a) so that the inorganic frame part of the n = 2 perovskites is ∼1.2 nm thick, approximately two times the thickness of [PbX 6 ] 4− octahedral layer, with one full unit cell contained within (Fig.…”