Aluminum Distearate–Modified CsPbX ₃ (X = I, Br, or Cl/Br) Nanocrystals with Enhanced Optical and Structural Stabilities

Abstract

Colloidal all-inorganic perovskite nanocrystals (PNCs), possessing unique optical properties, have attracted considerable attention in the field of semiconductor nanocrystals (NCs), but their application is hindered by the stability issue resulting partly from dynamic capping ligand binding. Herein, we report a simple method for the synthesis of all-inorganic cesium lead-based (CsPbX 3 ) NCs with enhanced structural stability and photoluminescence quantum yield. Aluminum distearate (AlDS) was introduced into the preparation of CsPbX 3 NCs, on the basis that the surface defects of CsPbX 3 NCs are passivated to form a protective layer on the CsPbX 3 NC surface simultaneously. Benefiting from surface modification, the resistance of the CsPbX 3 NC dispersion against ethanol, ultraviolet irradiation, and heat treatment was enhanced effectively. Moreover, the photoluminescence intensity and stability of the AlDS-modified NC-based films displayed functional superiority to those of pristine NC-based films.

Aluminum Distearate–Modified CsPbX 3 (X = I, Br, or Cl/Br) Nanocrystals with Enhanced Optical and Structural Stabilities

“…Pristine CsPbI 3 NCs possess a first excitonic peak at 678 nm and a PL emission peak at 686 nm, following literature reports. 39,40 The coating of AlDS resulted in a blueshift of both first excitonic absorption and PL emission peaks of CsPbI 3 NCs, and the degree of blueshift increased along with the increasing amount of AlDS introduced. Such a result could be attributable to the decreasing CsPbI 3 size, 41,42 which was confirmed by the TEM images shown in Figure 1a,b.…”

Stable Blue-Emitting CsPbBr3 Nanoplatelets for Lighting and Display Applications

“…Colloidal lead halide perovskite (LHP) nanocrystals (NCs) have emerged as one of the most fascinating materials for applications in various optoelectronic devices, including low-cost lighting-emitting diodes (LEDs), next-generation displays, solar cells, and so on. − Because of its high photoluminescence quantum yield (PLQY), narrow full width at half-maximum (FWHM), and versatility with a wide tunable band gap in the visible range, LHP research has been pushed to the forefront of lighting and display frontiers in recent years. − The key to achieving their application in wide-gamut and high-definition displays is to balance the luminescence of the three primary colors. Despite the great success red- and green-emitting perovskite NC-based LEDs have achieved, devices emitting that satisfy the National Television System Committee (NTSC) standard blue emission (460–470 nm) are still in their infancy, and their brightness and stability need to be improved. , To address this issue, it is crucial and urgent to develop pure blue perovskite CsPbBr 3 NCs with high PL efficiency and good stability.…”

Interface Engineering of Bi‐Fluorescence Molecules for High‐Performance Data Encryption and Ultralow UV‐Light Detection

“…[ 34 ] Currently, the research on such a significant, cheap, and stable biomass mainly focuses on its biological properties and its use as a capping ligand for perovskite nanomaterials. [ 33–40 ] These uses somehow reduce their true values. It should be noted that OA exhibits short‐wavelength absorption and emission.…”