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

Abstract

Organic multicolor heterostructures with spatially resolved luminescent colors and identifiable patterns have exhibited considerable potential for achieving micro-/nanoscale photonic barcodes. Nevertheless, such types of barcodes reported thus far are exclusively based on a single heterostructure with limited coding elements. Here, a directional self-assembly strategy is proposed to achieve high-coding-capacity spatially resolved photonic barcodes through rationally constructing organic hierarchical super-heterostructures, where numerous subheterostructure blocks with flat hexagonal facets are precisely oriented with their specific facets via a reconfigurable capillary force. The building blocks were prepared through a one-pot sequential heteroepitaxial growth, which enables the effective modulation of the structural and color characteristics in coding structures. Significantly, a directional facet-tofacet attraction between particles via facet registration leads to the formation of well-defined 1D super-heterostructures, which contain multiple coding elements, thus providing a good platform for constructing the high-coding-capacity photonic barcodes. The results may be useful in fabricating organic hierarchical hybrid super-heterostructures for security labels and optical data recording.

Spatially Resolved Organic Whispering‐Gallery‐Mode Hetero‐Microrings for High‐Security Photonic Barcodes

“…Compared with the green emissive light of the pure DCA assemblies, the obtained CT microcrystals (6 mol % Ant) exhibit strong yellow light emission under unfocused UV excitation (Figure S15), which correspond to the PL of DCA‐Ant CT complexes, suggesting that the efficient energy transfer from DCA to CT complexes occurs (Figure 2f; Figure S16) [19] . Moreover, powder X ray diffraction (PXRD) of CT powders were consistent with those of the pure host crystals (Figure S17), suggesting that the doping of Ant still maintains the original crystallographic structure of DCA [20] . Through the developed surface tension‐assisted assembly method, the yellow emissive microrings were effectively acquired (Figure 2g; Figure S18), which also display the excellent light‐confinement capacity and distinguishable sharp resonant peaks originating from the WGM modulation.…”

“…[19] Moreover, powder X ray diffraction (PXRD) of CT powders were consistent with those of the pure host crystals (Figure S17), suggesting that the doping of Ant still maintains the original crystallographic structure of DCA. [20] Through the developed surface tension-assisted assembly method, the yellow emissive microrings were effectively acquired (Figure 2g; Figure S18), which also display the excellent light-confinement capacity and distinguishable sharp resonant peaks originating from the WGM modulation.…”

Controllable and Low-Loss Electrochemiluminescence Waveguide Supported by a Micropipette Electrode

“…The other is the active optical waveguide that enables the transport of light self-generated under external light excitation or electrochemical stimulation. One-dimensional (1D) organic micro/nanocrystals assembled by small molecules are often used, whose optical properties can be regulated by the molecular structures and self-assembly reactions. , Indeed, thanks to their excellent light manipulation, molecular crystal-integrated optoelectronic devices have emerged as a promising platform for optical interconnects, data coding/decoding, optical logic gates, and chemical gas sensors . However, the waveguiding performance often suffers from the optical loss .…”