Implications of gas-barrier properties in realizing the self-recovery of photodegraded CsPbBr₃ perovskite nanocrystals

Abstract

Fluorescent CsPbBr3 perovskite nanocrystals (NCs) degraded by photoinduced desorption of surface ligands can exhibit self-recovery; however, irreversible oxidative damage from oxygen in the atmosphere must be avoided. In this work,...

Improving the thermal resistance of fluorescent CsPb(Br,I) 3 perovskite quantum dots by surface modification with perfluorodecanoic acid

“…The initial PL intensities before heating are normalized to 100%. A shoulder peak at longer wavelength is observed for the dried film samples, as reported in our previous works [ 32 , 33 , 40 ]. This may be explained by the photon recycling effect [ 41 ].…”

Visible Light-Driven Luminescence Evolution of CsPbBr3 Quantum Dots via Surface Reconstruction

“…However, some partial precipitations are observed at the bottom, which are due to the loss of ligands, resulting in the aggregation of QDs (Figure S6). However, the PL intensity of CsPbBr 3 QDs increases with a slight blue shift after two days of storage, which is ascribed to the fact that the desorbed surface ligands are newly adsorbed at the surface of CsPbBr 3 QDs, resulting in the self-recovery of CsPbBr 3 QDs . Thus, the fluorescence recovery can be observed only under the synergistic effect of the NAC ligand exchange and light illumination.…”

“…However, the PL intensity of CsPbBr 3 QDs increases with a slight blue shift after two days of storage, which is ascribed to the fact that the desorbed surface ligands are newly adsorbed at the surface of CsPbBr 3 QDs, resulting in the self-recovery of CsPbBr 3 QDs. 46 Thus, the fluorescence recovery can be observed only under the synergistic effect of the NAC ligand exchange and light illumination. Meanwhile, different irradiative spectra (including ultraviolet, visible, and near-infrared light) were employed to illuminate the CsPbBr 3 QD solution.…”

Aging Effects on the Exciton Relaxation and Diffusion Processes in CsPbBr3 Nanocrystals

“…Perovskite materials are of great interest in many fields of applications, such as photovoltaic, optoelectronic, and photonic, due to their electronic and optical properties, as well as the low different elements leading to perovskite degradation, water and moisture are particularly important and result in irreversible degradation due to decomposition of the active material [17,20] and reversible interactions leading to variations in the emission intensities and lifetimes. [18,[21][22][23] This is particularly important for NC films, which are characterized by larger surface/volume ratios relative to bulk polycrystalline thin films and higher surface defect densities.…”