Recycling Lead (II) Management in Metal Organic Framework‐Perovskite Luminescent Composites

Abstract

Colloidal lead halide perovskites face challenges in practical optoelectronic applications due to the toxicity of lead (II). To overcome this issue, a novel approach using metal‐organic frameworks (MOFs) for recycling lead (II) management in perovskite materials, is developed. Through surface‐functionalization of MOF‐808 and pH tuning, the MOF achieves recyclable adsorption‐desorption of lead (II), confining the lead source within the MOF‐808 template or the perovskites. This controllable transformation between lead (II) chelation and perovskites prevents lead (II) leakage. Additionally, separated lead (II) ions from decomposed perovskite can be adsorbed by MOF‐808, facilitating recycling. The resulting MOF‐808‐EDTA@CsPbBr3 composite exhibits comparable optical performance to pure CsPbBr3 powder, but with improved stabilities, effectively preventing lead (II) leakage. Hierarchical desorption of lead (II) in the MOF‐808‐EDTA@Pb2+ complex enables reversible on/off fluorescence signal switching. Detached lead (II) from decomposed MOF‐808‐EDTA@CsPbBr3 composite can be re‐adsorbed by MOF‐808‐EDTA, enabling the construction of CsPbBr3 nanocrystals in a new cycle. This approach is economically attractive and environmentally friendly. This study addresses the challenge of lead (II) leakage and offers the potential for optical anti‐counterfeiting in perovskite materials with a sustainable approach.

Two-Dimensional Hybrid Perovskite with High-Sensitivity Optical Thermometry Sensors

“…Specifically, the N–H scissor peak shifted from 1616 to 1610 cm –1 , while the N–H stretch peak shifted from 3345 to 3375 cm –1 . These observations indicate a change in the chemical environment of amine group in DA 2 PbBr 4 changes after Mn 2+ doping. ,, …”

“…These observations indicate a change in the chemical environment of amine group in DA 2 PbBr 4 changes after Mn 2+ doping. 8,21,22 To further confirm the effect of Mn 2+ introduction in (DA) 2 PbBr 4 , X-ray photoelectron spectroscopy (XPS) spectra of pure and Mn 2+ -doped (DA) 2 PbBr 4 were characterized (Figures 2c and S9). As shown in Figure S8, the XPS spectra exhibit signals corresponding to C 1s, N 1s, Pb 4f, Br 3d, and Mn 2p.…”

High Proton Conductivity Membrane Based on Sulfonated Polybenzimidazole by Doping Ethylenediaminetetraacetic Acid-Modified MOF-808 for Vanadium Flow Battery

“…As shown in Figure 1a,b, MOF-808 is a highly complete octahedral structure. 13,27 Figure 1c,d reveals that after MOF-808 is grafted by EDTA, MGE does not change significantly in its morphology. The XRD patterns of MGE are consistent with those of MOF-808 as shown in Figure 1e, which shows that the crystal structure of material remains undamaged by EDTA's functionalization.…”

In Situ Self-Assembled 1D/3D Mixed-Dimensional Perovskite Heterostructures for Efficient White Light Emission

“…MDPs show great white-emitting potential in solid-state lighting due to their efficient carrier/exciton funnelling behaviors from a low-dimensional wide band gap to a 3D narrow band gap. − For example, quasi-2D MDPs were found to promote radiative recombination by confining charge carriers to smaller domains, as a result increasing the luminous efficiency. , Additionally, 2D/3D MDPs enhance carrier transport by passivating the defects and reducing the density of defect states, thus improving the luminous efficiency. − Theoretically, 1D perovskites, characterized by an elongated 1D [PbX 6 ] 4– octahedron skeleton frame, exhibit strong quantum confinement effects, offering ideal energy gradients for the efficient funneling of higher energetic excitons from 1D to 3D, although this phenomenon remains undiscovered. Currently, MDP research primarily concentrates on enhancing the luminous efficiency and stability of 3D perovskites, − overlooking the integration of self-trapped broadband emission from low-dimensional perovskites to control the emission spectrum. Hence, the systematic regulation of multiexciton emission in single MDP materials is yet to be achieved.…”