Bidentate aliphatic quaternary ammonium ligand-stabilized CsPbBr₃perovskite nanocrystals with high PLQY (92.3%) and superior stability

Abstract

The stability of perovskite nanocrystals (NCs) is greatly limited due to highly dynamic binding of ligands, which hinders their applications in optoelectronic devices. In this paper, a new ligand strategy...

Stable Core–Shell Structure Nanocrystals of Cs4PbBr6-Zn(moi)2 Achieved by an In Situ Surface Reconstruction Strategy for Optical Anticounterfeiting

“…The characteristic peaks at 12.9, 20.2, 22.5, 25.5, 27.5, 28.7, 30.4, 31.2, 34.6, and 39.0° correspond to the (110), (113), (030), (204), (131), (214), (223), (006), (134), and (324) planes, respectively, which is in good agreement with previous reports on the pure rhombohedral phase of Cs 4 PbBr 6. , High-resolution X-ray photoelectron spectroscopy (XPS) was used to completely identify the shell composition in the Cs 4 PbBr 6 -Zn­(moi) 2 NCs . As depicted in Figures b and S3, the quantitative calculation data indicate that the S/Zn atomic ratio is 1.96.…”

“…15,33 High-resolution X-ray photoelectron spectroscopy (XPS) was used to completely identify the shell composition in the Cs 4 PbBr 6 -Zn(moi) 2 NCs. 34 As depicted in Figures 3b and S3, the quantitative calculation data indicate that the S/Zn atomic ratio is 1.96. In addition, the EDS line scan across the shell area in Cs 4 PbBr 6 -Zn(moi) 2 is shown in Figure S4, and the S/Zn atomic ratio is also approximately to 2.…”

Amine-Free Synthetic Route: An Emerging Approach to Making High-Quality Perovskite Nanocrystals for Futuristic Applications

“…Using the same LARP method, the Xie group synthesized highquality and photostable amine-free CsPbBr 3 PNCs using the bidentate aliphatic quaternary ligand N1,N2-didodecyl-N1,N1,N2,N2-tetramethylethane-1,2-diaminium bromide (DTDB). 58 To study the effect of chain length of quaternary alkylammonium in the LARP method, Liu's group synthesized amine-free CsPbBr 3 PNCs using cetyltrimethylammonium bromide (CTAB), dodecyl trimethylammonium (DTAB), and stearyl trimethylammonium bromide (STAB) as both bromine sources and surface-capping ligands, where alkyl groups acted as a protective layer. 59 The library of surfacecapping ligands was expanded by Lin's group, as the amine-free CsPbBr 3 PNCs synthesized at low temperatures using unique chelating diphenyl ammonium bromide as both the halide source and the surfactant exhibited enhanced brightness and current efficiency and were eligible for use in practical LED devices.…”

“…While the HI techniques mentioned above are suitable for producing metal halide-based PNCs with a high degree of control, they require temperatures. Moreover, they cannot be used for large-scale synthesis. , These problems can be dodged by employing other synthesis routes, such as LARP, which can produce gram-scale yields of PNCs even under an open atmosphere. LARP techniques permit the synthesis of hybrid organic–inorganic and completely inorganic PNCs systems at room temperature with significant control over the shape of the PNCs.…”

“…These K + ions act as a protective passivating layer on the surfaces of the PNCs and reduce surface defects. Using the same LARP method, the Xie group synthesized high-quality and photostable amine-free CsPbBr 3 PNCs using the bidentate aliphatic quaternary ligand N 1, N 2-didodecyl- N 1, N 1, N 2, N 2-tetramethylethane-1,2-diaminium bromide (DTDB) …”