Room Temperature Fabrication of Stable, Strongly Luminescent Dion-Jacobson Tin Bromide Perovskite Microcrystals Achieved through Use of Primary Alcohols.

Jinsong Qi,Shixun Wang,Andrey L Rogach,Stephen V Kershaw,Arsenii Portniagin

doi:10.3390/nano11102738

Jinsong Qi, Shixun Wang + Show 3 more

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https://doi.org/10.3390/nano11102738

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Abstract

Lead-free two-dimensional metal halide perovskites have recently emerged as promising light-emitting materials due to their improved stability and attractive optical properties. Herein, a facile room temperature wet milling method has been developed to make Dion–Jacobson (DJ) phase ODASnBr4 perovskite microcrystals, whose crystallization was accomplished via the aid of introduced primary alcohols: ethanol, butanol, pentanol, and hexanol. Due to the strong intermolecular hydrogen bonding, the use of ethanol promoted the formation of non-doped ODASnBr4 microcrystals, with an emission peaked at 599 nm and a high photoluminescence quantum yield (PL QY) of 81%. By introducing other primary alcohols with weaker intermolecular hydrogen bonding such as butanol, pentanol, and hexanol, [SnBr6]4− octahedral slabs of the DJ perovskite microcrystals experienced various degrees of expansion while forming O–H…Br hydrogen bonds. This resulted in the emission spectra of these alcohol-doped microcrystals to be adjusted in the range from 572 to 601 nm, while keeping the PL QY high, at around 89%. Our synthetic strategy provides a viable pathway towards strongly emitting lead-free DJ perovskite microcrystals with an improved stability.

Highlights

Metal halide perovskites have recently emerged as a popular material owing to their attractive optical properties, such as tunable absorption and photoluminescence (PL), and high defect tolerance [1]
The toxicity of lead which still remains the main constituent of the large variety of the reported metal halide perovskites, and their poor stabilities towards polar solvents and light irradiation greatly limit the practical application of 3D perovskites
Powder X-Ray diffraction (XRD) patterns were collected to compare the structural characteristics of perovskites produced using different primary alcohols

Summary

Introduction

Metal halide perovskites have recently emerged as a popular material owing to their attractive optical properties, such as tunable absorption and photoluminescence (PL), and high defect tolerance [1]. The toxicity of lead which still remains the main constituent of the large variety of the reported metal halide perovskites, and their poor stabilities towards polar solvents and light irradiation greatly limit the practical application of 3D perovskites. Popper (RP) and Dion–Jacobson (DJ) perovskites, have ignited the interest of scientists owing to their higher structural stability and at the same time their rather promising PL performance [5,6,7]. These 2D structures retain the main structural feature of a 3D perovskite lattice, in which octahedral metal halide units are connected by shared corners. The interlayers between the planes of interconnected octahedra of the 2D perovskites are populated with monovalent or divalent long-chain organic cations, which

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