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

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.

Highly luminescent broadband phosphors based on acid solvent coordinated two-dimensional layered tin-based perovskites

“…The material prepared by the wet milling method presents a typical 2D sheet like morphology with a lateral length of around 10 μm. 33 In our work, a saturation recrystallization process in ambient environment conditions was developed for the preparation of highly luminous DJ phase ODASnX 4 perovskites. The structure of the obtained material is flake microcrystals.…”

“…28 Very recently, DJ phase ODASnBr 4 (ODA denotes protonated 1,8-octanediamine) microcrystals have been reported via a ligand assisted re-precipitation method, 28 an argon gas assisted saturation recrystallization method 29 and a wet grinding method. 33 The final product prepared by the above methods contains impurities. Further, in order to obtain a pure phase product, additional primary alcohols were introduced to treat the byproducts and thus pure ODASnBr 4 perovskite microcrystals with the PLQY approaching 90% were obtained in a sealed environment.…”

Spacer Switched Two-Dimensional Tin Bromide Perovskites Leading to Ambient-Stable Near-Unity Photoluminescence Quantum Yield

“…Under similar conditions, the PLQY of 6N6-DJ is significantly affected. The PLQY of 8N8-DJ excels over the reported results of Sn-based layered perovskites (Table S9), ,,,− Pb-free organic–inorganic composites (Table S10), ,− and Pb-based layered perovskites (Table S11), ,− while that of the unstable 8N-RP perovskite is still comparable to the best reports. Our experimental results assert that 8N8-DJ is several notches above the RP counterpart (8N-RP), the analogous 8N8PbBr 4 , and the DJ perovskites with shorter spacer lengths in terms of its PLQY and ambient stability.…”

Spacer Switched Two Dimensional Tin Bromide Perovskites Leading to Ambient Stable Near Unity Photoluminescence Quantum Yield

“…Under similar conditions, the PLQY of 6N6-DJ is significantly affected. The PLQY of 8N8-DJ excels over the reported results of Snbased layered perovskites (Table S7), [8][9]13,[40][41][42][43][44][45][46][47][48] Pb-free organic-inorganic composites (Table S8), 29,[49][50][51][52] and Pb-based layered perovskites (Table S9), 7,[53][54][55][56][57][58] while that of the unstable 8N-RP perovskite is still comparable to the best reports.Our experimental results assert that 8N8-DJ is several notches above than the RP counterpart (8N-RP), the analogous 8N8PbBr4 and the DJ perovskites with shorter spacer lengths, in terms of its PLQY and ambient stability.…”