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Room Temperature Synthesis of Phosphine‐Capped Lead Bromide Perovskite Nanocrystals without Coordinating Solvents
Author(s) -
Ambroz Filip,
Xu Weidong,
Gadipelli Srinivas,
Brett Dan J. L.,
Lin ChiehTing,
Contini Claudia,
McLachlan Martyn A.,
Durrant James R.,
Parkin Ivan P.,
Macdonald Thomas J.
Publication year - 2020
Publication title -
particle and particle systems characterization
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.877
H-Index - 56
eISSN - 1521-4117
pISSN - 0934-0866
DOI - 10.1002/ppsc.201900391
Subject(s) - perovskite (structure) , nanocrystal , photoluminescence , phosphine , trioctylphosphine oxide , ligand (biochemistry) , dimethylformamide , bromide , solvent , chemistry , materials science , photochemistry , chemical engineering , inorganic chemistry , nanotechnology , organic chemistry , catalysis , optoelectronics , biochemistry , receptor , extraction (chemistry) , engineering
The room temperature synthesis of perovskite nanocrystals (NCs) is typically achieved by employing a ligand‐assisted reprecipitation (LARP) method, which can be handled in air, and its products are comparable to what is obtained using the traditional hot‐injection method. However, the LARP method typically requires the use of coordinating polar solvents such as dimethylformamide, which are not appropriate for large‐scale production due to toxicity concerns and can also degrade or form defective perovskite NCs. Herein, an amine and oleic‐acid‐free room temperature synthesis of lead bromide perovskite NCs is reported that uses a combination of trioctylphosphine oxide and diisooctylphosphinic acid ligands. This combination of ligands provides a stable platform for the polar‐solvent‐free synthesis in air of fully inorganic CsPbBr 3 (fwhm ≈ 14 nm, emission = 519 nm) and hybrid organic‐inorganic FAPbBr 3 (fwhm ≈ 19 nm) NCs with photoluminescence emission between 530 and 535 nm, which is in line with the Rec. 2020 color standards. In addition, it is shown that compared to a traditionally used ligand combination, phosphine ligands can be easily removed from the surface of the NCs, which is important for the future development of this technology in optoelectronic devices.