Shape-engineering of organic heterostructures via a sequential self-assembly strategy for multi-channel photon transportation

Abstract

The controlled self-assembly of organic heterostructures (OHSs) with precisely defined compositions, architectures, and interfaces, have largely remained a challenge. Herein, we introduce an effective approach to accurately construct three types of axial branching OHSs including unilateral axial OHSs, bilateral single-branching axial OHSs and bilateral multi-branching axial OHSs through modulating hierarchical charge-transfer intermolecular interactions and sequential crystal nucleation rate on account of the two different cocrystals with the low lattice mismatching rate of ~ 2.2%. The present work opens an avenue for rationally designing and finely synthesizing more kinds of OHSs.

Two-Dimensional Lanthanide Metal–Organic Framework Heterostructures for Noninvasively Photoresponsive High-Security Photonic Barcodes

“…Micro/nanoscale photonic barcodes with high concealment hold great potential for item tracking, biomedical imaging, and information security. − The ever-increasing demand for high-security levels in the field of anticounterfeiting necessitates micro/nanoscale barcodes that demonstrate accurate identification, high encoding capacity, and multiple authentication capabilities. − Transforming photoluminescence (PL) properties into specific spectral recognition codes is considered as a basic principle for designing novel micro/nanoscale photonic barcodes. − Luminescent metal–organic frameworks (MOFs) simultaneously possess high stability of inorganic materials and excellent processability of organic materials, which thus have emerged as robust photonic barcode platforms. − Especially, lanthanide (Ln) ions are widely believed to be ideal emitting sources of MOFs due to their unique narrow-line emission characteristics with a series of well-resolved peaks and the favorable lattice matching between Ln-MOFs enables the epitaxial growth of heterojunctions, resulting in an increased number of color-coded blocks in spatial dimensions, thereby enhancing the encoding capacity. − However, the practical application of Ln-MOFs with static luminescent signals in confidential information protection is limited due to their direct readout nature. , …”

Directional Self-Assembly of Facet-Aligned Organic Hierarchical Super-Heterostructures for Spatially Resolved Photonic Barcodes

“…Micro-/nanoscale photonic barcodes featuring a small size have drawn extensive research attention owing to their various applications ranging from multiplexed bioassays and materials tracking to information security. − Multicolor heterostructures featuring identifiable color patterns have been regarded as a good system for achieving micro-/nanoscale photonic barcodes. − Benefiting from the outstanding compatibility and easy processability of the organic materials, − molecular self-assembly has gradually been developed into one of the main routes to constructing the segmented heterostructures through regulating the arrangements of the molecular blocks. ,− Most of the organic heterostructures in previous works were constructed through a stepwise epitaxial growth. However, with the growth of the organic heterostructures, the prefabricated crystals have difficult in maintaining activity and are incapable of acting as seed crystals to allow the following growth.…”