Ligand and adjuvant dual-assisted synthesis of highly luminescent and stable Cs₄PbBr₆ nanoparticles used in LEDs

Abstract

We developed a new room temperature colloidal method for the synthesis of highly luminescent and stable Cs4PbBr6 nanoparticles, in which acetone, oleamine and oleic acid were used as precursors, while water and dimethyl sulfoxide were used as adjuvants.

Phase engineering of inorganic halide Cs–Pb–Br perovskites for advanced energy conversion

“…16,33,34,42–44 In addition, 0D Cs 4 PbBr 6 perovskites exhibit higher moisture and heat stabilities than those of 3D CsPbBr 3 . 45 0D Cs 4 PbBr 6 /3D CsPbBr 3 composites with good lattice matching improve the stability of 3D CsPbBr 3 , including the formation of core/shell structures and heterostructures. 43,46–48 2D tetragonal CsPb 2 Br 5 perovskites 49 have a sandwich-like structure with a layer of Cs − ions inserted between the two adjacent Br–Pb layers as shown in Fig.…”

One-Pot Synthesis of All-Inorganic CsPbClBr2 Blue Perovskite Quantum Dots via Stoichiometric Precursor

“…Notably, additional reactions within the precursor are induced when nonstoichiometric ratios of the perovskite precursor are used. For example, CsPb 2 Br 5 is generated and coexists with the QDs owing to the excess of PbBr 2 in the process of synthesizing CsPbBr 3 QDs. ,, In addition, in the intermediate PbBr 2 ·DMF, the Pb–O bond is gradually replaced by Pb–Br to form Cs 4 PbBr 6 . ,, In other words, when preparing a precursor for PQD synthesis, the efficiency and stability of the synthesized QDs decrease owing to the coexistence of CsPb 2 X 5 and Cs 4 PbX 6 , which are adducts of CsPbX 3 . In addition, all of them showed blue light emission in the wavelength range between 450 and 500 nm, and the quantum yield (QY) was confirmed to be the highest at 70.55% in the 1:1 ratio condition.…”