Micro/nanoscale multicolor barcodes with unique identifiability and a small footprint play significant roles in applications such as multiplexed labeling and tracking systems. Now, a strategy is reported to design multicolor photonic barcodes based on 1D Ln‐MOF multiblock heterostructures, where the domain‐controlled emissive colors and different block lengths constitute the fingerprint of a corresponding heterostructure. The excellent heteroepitaxial growth characteristics of MOFs enable the effective modulation of the coding structures, thereby remarkably increasing the encoding capacity. The as‐prepared multicolor barcodes enable an efficient authentication and exhibit great potential in fulfilling the functions of anti‐counterfeiting, information security, and so on. The results will pave an avenue to novel hybrid MOFs for optical data recording and security labels.
Porous
organic frameworks have emerged as the promising platforms
to construct tunable microlasers. Most of these microlasers are achieved
from metal–organic frameworks via meticulously accommodating
the laser dyes with the sacrifice of the pore space, yet they often
suffer from the obstacles of either relatively limited gain concentration
or sophisticated fabrication techniques. Herein, we reported on the
first hydrogen-bonded organic framework (HOF) microlasers with color-tunable
performance based on conformation-dependent stimulated emissions.
Two types of HOF microcrystals with the same gain lumnogen as the
building block were synthesized via a temperature-controlled self-assembly
method. The distinct frameworks offer different conformations of the
gain building block, which lead to great impacts on their conjugation
degrees and excited-state processes, resulting in remarkably distinct
emission colors (blue and green). Accordingly, blue/green-color lasing
actions were achieved in these two types of HOFs based on well-faceted
assembled wire-like cavities. These results offer a deep insight on
the exploitation of HOF-based miniaturized lasers with desired nanophotonics
performances.
Micro/nanoscale multicolor barcodes with unique identifiability and a small footprint play significant roles in applications such as multiplexed labeling and tracking systems. Now, a strategy is reported to design multicolor photonic barcodes based on 1D Ln‐MOF multiblock heterostructures, where the domain‐controlled emissive colors and different block lengths constitute the fingerprint of a corresponding heterostructure. The excellent heteroepitaxial growth characteristics of MOFs enable the effective modulation of the coding structures, thereby remarkably increasing the encoding capacity. The as‐prepared multicolor barcodes enable an efficient authentication and exhibit great potential in fulfilling the functions of anti‐counterfeiting, information security, and so on. The results will pave an avenue to novel hybrid MOFs for optical data recording and security labels.
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