Laterally Engineering Lanthanide‐MOFs Epitaxial Heterostructures for Spatially Resolved Planar 2D Photonic Barcoding

Abstract

Metal-organic frameworks (MOFs) heterostructures with domain-controlled emissive colors have shown great potential for achieving high-throughput sensing, anti-counterfeit and information security.H ere,astrategy based on sterichindrance effect is proposed to construct lateral lanthanide-MOFs (Ln-MOFs) epitaxial heterostructures,where the channel-directed guest molecules are introduced to rebalance inplane and out-of-plane growth rates of the Ln-MOFs microrods and eventually generate lateral MOF epitaxial heterostructures with controllable aspect ratios.Alibrary of lateral Ln-MOFs heterostructures are acquired through as tepwise epitaxial growth procedure,from which rational modulation of each domain with specific lanthanide doping species allows for definition of photonic barcodes in at wo-dimensional (2D) domain with remarkably enlarged encoding capacity.T he results providem olecular-level insight into the use of modulators in governing crystallite morphology for spatially assembling multifunctional heterostructures.

Nanoscale Double‐Heterojunctional Electrocatalyst for Hydrogen Evolution

“…Since the double heterostructure laser was first proposed in 1963 by Alferov and Kazarinov, [ 7 ] double heterostructure ushered in rapid development in various systems among electronics, optics, and light, especially semiconductor crystals and devices, to modify their fundamental parameters, including refractive indices, bandgaps, and electron energy spectrum. [ 8 ] Currently, double heterostructure where two wider bandgap semiconductor sandwich a smaller bandgap material, are widely applied in optoelectronics due to the low threshold voltage and efficient carrier injection, yet unreported in electrocatalysis. [ 9 ] For electrocatalysts, heterostructure is an effective strategy to provide sufficient active sites, improve the electrical conductivity and enhance structural stability, synergistically promoting electrocatalytic performance.…”

Multicolor Random Lasers Based on Perovskite Quantum Dots Embedded in Intrinsic Pb–MOFs

“…Metal–organic frameworks (MOFs), as a fascinating class of porous crystalline materials, have been extensively studied in the field of micro/nanophotonics including micro/nanolasers. − The well-defined and interconnected nanoporous channels in MOFs could effectively encapsulate and prevent the aggregation of optically active centers by providing a physical barrier. − In addition, the outstanding flexibility to self-assemble into various micro/nanostructures suggests that MOFs nanostructures can serve as excellent scattering centers to construct novel random lasers. − In conventional approaches, the incorporation of PQDs into the MOFs matrix usually involves two separate steps of immersing the MOFs matrix into the solutions of lead halide following methylammonium salts to allow the adsorption of precursor on the wall of MOFs to enable the formation of PQDs . Since different precursor ions exhibit distinct electric charges and ion radii, these ions possess different affinities to the MOF microenvironment, leading to the generation of a rather limited amount of PQDs in MOFs.…”

Electric‐Tunable Photoluminescence of 2D ErOCl for High‐Security Encryption of Programmable Information

“…energy transitions and shielded 4f orbitals of RE ions, 2D RE materials can have multiple sharp emission peaks spanning over ultraviolet to infrared and there might be some coupling between these emission transitions under some external stimuli, which will facilitate with the multimode regulation for high-security encryption of programmable information. [22][23][24][25][26] With ultrathin thickness and flexibility, 2D RE materials will be conducive for miniaturization and integration, avoiding the complex and high-cost designing. [27] Therefore, 2D RE materials have shown great potential for high-security encryption as excellent candidates of neotype medium.…”