4‐Bromo‐Butyric Acid‐Assisted In Situ Passivation Strategy for Superstable All‐Inorganic Halide Perovskite CsPbX₃ Quantum Dots in Polar Media

Abstract

A crucial challenge is to develop an in situ passivation treatment strategy for CsPbX3 (CPX, X=Cl, Br, and I) quantum dots (QDs) and simultaneously retain their luminous efficiency and wavelength. Here, a facile method to significantly improve the stability of the CPX QDs via in situ crystallization with the synergistic effect of 4‐bromo‐butyric acid (BBA) and oleylamine (OLA) in polar solvents including aqueous solution and a possible fundamental mechanism are proposed. Monodispersed CsPbBr3 (CPB) QDs obtained in water show high photoluminescence quantum yields (PLQYs) of 86.4 % and their PL features of CPB QDs have no significant change after being dispersed in aqueous solution for 96 h, which implies the structure of CPB QDs is unchanged. The results provide a viable design strategy to synthesize all‐inorganic perovskite CPX QDs with strong stability against the attack of polar solvents and shed more light on their surface chemistry.

Achieving High-Efficiency Large-Area Luminescent Solar Concentrators

“…Perovskite quantum dot have been widely used in the field of optoelectronics due to their excellent optoelectronic properties, ultrahigh photoluminescence quantum yield (PLQY), optical tunability, narrow-band emission, wide color gamut, and solution synthesizable advantages. − Lead-based halide perovskite can achieve a modulating effect on the PL spectrum by changing the halogen species and ratio, which predicts relatively controllable optical properties and makes it easier for people to adjust the material’s corresponding absorption and emission spectra. − The ease of doping in perovskite quantum dots gives them greater advantages such as enhanced stability, variable emission and absorption spectra, high PLQY, etc. − Similarly, these excellent properties have led to the application of perovskites in the field of LSCs.…”

Graphical Abstract: Angew. Chem. Int. Ed. 22/2022

“…To date, their synthesis with high molecular weights was reserved for catalysts featuring transition metals. Calix [4]pyrrolato aluminate is introduced as the first transition metal-free catalytic system for the dehydropolymerization of phenylphosphine borane. Initial mechanistic investigations indicate metal-ligand cooperativity of the aluminate.…”

Enhanced energy transfer by Sb ion doping for efficient CsPbCl3:Mn2+perovskite nanocrystals and light emitting diodes

“…All inorganic lead halide perovskite nanocrystals (NCs), CsPbX 3 (Cl, Br and I), are emerging as an attractive class of materials for optoelectronic applications due to their outstanding optical properties, e.g., composition-tunable emission covering the full visible spectrum, [1][2][3][4][5] high photoluminescence quantum yield (PLQY), [6][7][8][9] low-cost, etc. 10 Recently, doping metal ions into perovskite NCs, such as transition metal ions or lanthanide ions, has been widely investigated because of the enriched optical properties and the improved photoelectric performance.…”