On direct synthesis of high quality APbX₃ (A = Cs⁺, MA⁺ and FA⁺; X = Cl⁻, Br⁻ and I⁻) nanocrystals following a generic approach

Abstract

A generic method of obtaining APbX3 (A = Cs+, MA+ and FA+; X = Cl−, Br− and I−) perovskite NCs, emitting throughout the entire visible region (395–760 nm), has been developed employing 1,3-dihalo-5,5-dimethylhydantoin (DXDMH) as a halide precursor.

Stable and Intense Violet-Emitting CsPbCl3 Nanocrystals for Light-Emitting Diodes: Directly Obtained by L-Type Surface Passivation

“…Bright-field transmission electron microscope (TEM) images show a cubic morphology and a tight size distribution of the NCs with an average edge-length of ∼8.7 ± 1.2 nm (Figures B, S3, and S4). Clearly observable lattice fringes in the high-resolution image indicate high crystallinity of the CsPbCl 3 NCs (Figure S5) and a lattice spacing of ∼0.56 nm corresponding to the (100) planes, which is in agreement with the literature . The powder X-ray diffraction (PXRD) pattern matches with the cubic crystal structure (ICSD Code: 23108) of the NCs (Figure C) and suggests high phase purity of the sample.…”

“…The reaction temperature and S5) and a lattice spacing of ∼0.56 nm corresponding to the (100) planes, which is in agreement with the literature. 20 The powder X-ray diffraction (PXRD) pattern matches with the cubic crystal structure (ICSD Code: 23108) of the NCs 16 (Figure 1C) and suggests high phase purity of the sample.…”

“…The CsPbCl 3 NCs prepared in this method use DCDMH as a chloride precursor, and further experimental details can be found in our recent report …”

“…The CsPbCl 3 NCs prepared in this method use DCDMH as a chloride precursor, and further experimental details can be found in our recent report. 20 Repeated Washing of the NCs. For washing with MeOAc (or hexane), the hexane-dispersed solution of the NCs was mixed with MeOAc in a 1:1 ratio and centrifuged at 7k rpm for 5 min.…”

“…Following the first synthesis of the CsPbCl 3 NCs, a number of methods have been developed later employing an independent source of chloride for obtaining more luminescent systems. − However, these moderately stable NCs , are not good enough for applications like LEDs due to the insulating nature of high-density long-chain capping ligands. , Except for a very recent work by Qi and co-workers, who succeeded in obtaining strongly luminescent (PLQY ∼ 71%) and stable CsPbCl 3 NCs with low-density surface capping ligands and fabricated LED with an efficiency of ∼0.18% using these systems, we are not aware of any other work reporting such desired qualities of these NCs.…”