Acid-mediated phase transition synthesis of stable nanocrystals for high-power LED backlights

Abstract

Stable perovskite nanocrystals were obtained by acid-mediated phase transition synthesis and applied to a high-power white light LED.

CsBr-Triggered Reversible Phase Transition of Perovskite Nanocrystals for Advanced Information Encryption and Decryption

“…In addition, X-ray photoelectron spectroscopy (XPS) was utilized to investigate the composition of surface elements and chemical valence changes of CsPbBr 3 and CsPbBr 3 –HBr. The wide-scan XPS spectra (Figure a) and the high-resolution XPS spectra of Cs 3d and Br 3d of the two samples show no significant difference (Figure S9), and the peak positions of the binding energy are consistent with literature reports . However, the binding energy of the Pb 4f orbital in CsPbBr 3 –HBr is reduced by 0.2 eV and that of the O 1s orbital is reduced by 0.1 eV due to the removal of organic ligands on the NC surface caused by HBr treatment (Figure b,c).…”

“…The synthesis of Cs 4 PbBr 6 NC precursor utilized the chemical conversion method . In brief, PbBr 2 (0.0748 g) was added in 0.4 mL of OA, 3 mL of OAm, and 10 mL of ODE.…”

Atomic layer deposition in advanced display technologies: from photoluminescence to encapsulation

“…As shown in figure 3(a), B-site ion doping can enhance the phase and thermal stabilities of perovskite nanocrystals, and firstprinciples calculations suggest that B-site ions with small radii effectively increase the formation energy of the perovskite structure [39]. To passivate surface defects and reduce non-radiative recombination, Lewis acids, trimethylaluminum (TMA), and hydrobromic acid have been used to promote phase transformation from Cs 4 PbBr 6 to luminous CsPbBr 3 perovskite nanocrystals, while also passivating the luminous nanocrystals in situ [40]. As indicated in figure 3(b), an X-type ligand containing Br − can undergo ligand exchange with the long chain ligand on the surface.…”

Shape-controlled synthesis of one-dimensional cesium lead halide perovskite nanocrystals: methods and advances

“…Cs 4 PbX 6 NCs enabled chemical transformation into CsPbX 3 NCs via water-triggered interfacial reaction at oil/water interface (Scheme 3). 68,77,78 The mechanism of this transformation is that Cs 4 PbX 6 NCs in nonpolar solvent lose CsX at a nonpolar solvent/water interface owing to good solubility of CsX in water and thus convert into CsPbX 3 NCs. [79][80][81][82][83][84][85] Employing this principle, CsPbBr 3 NWs or NRs can be produced via direct or indirect transformation from Cs 4 PbX 6 NCs.…”