Polychrome photonic crystal stickers with thermochromic switchable colors for anti-counterfeiting and information encryption

Li, Huateng; Zhu, Mengjing; Tian, Feng; Wei, Hua; Guo, Jia; Wang, Changchun

doi:10.1016/j.cej.2021.130683

Cited by 42 publications

(50 citation statements)

References 67 publications

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“…However, the 3D assembly fabrication methods for 3D PhC devices based on nanospheres are missing research, limited by intrinsic drawbacks of poor mechanical behavior and microstructural defects (dislocation, point/line defects, and crack). Meanwhile, previous works about multicolor PhC materials were usually based on the combination of PhC films with dyes and pigments. − These films showed luminous color and a single structural color, promoting smart decoration and anticounterfeiting application, but they still could not achieve 3D devices with dual structural colors that are of great significance in advanced 3D photonic devices.…”

Section: Introductionmentioning

confidence: 99%

Reversible Photochromic Photonic Crystal Device with Dual Structural Colors

Zhao

Wang

et al. 2022

ACS Appl. Mater. Interfaces

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Photonic crystal (PhC) light emitter (PC-LE) devices attract extensive attention in anticounterfeiting for their manipulated light emission and iridescent structural color, but their large-scale three-dimensional fabrication is still limited by poor mechanical strength and microstructural defects. Herein, colloidal nanospheres incorporated with photoluminescent dye were assembled to three-dimensional PC-LE devices through a large-scale compressing-induced strategy, which realized dual iridescent and reversible photochromic colors. Periodically distributed refractive indices between molten molecular chains and cross-linked nanospheres generated the iridescent structural color. Subsequently, the device surface reflected another different structural color after partially removing the surface molecular chains by etching. The light emission intensity of the dye was sufficient to obtain the reversible photochromic colors. Simultaneously, the manipulation toward light emission of the photonic band gap achieved the shape of the photoluminescent intenstiy spectra that varied in accordance with the reflective peak. Furthermore, by use of screen-printing tools and transparent masking glue, the etching process became an inkless color printing process, generating a colorful bar code (2 cm × 2 cm) on the device surface. The code was reversibly displayed and encrypted through control of the reflection and emission of light. Significantly, the PC-LE devices opened up a new route for advanced display, color printing, and anticounterfeiting stickers.

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Section: Introductionmentioning

confidence: 99%

Reversible Photochromic Photonic Crystal Device with Dual Structural Colors

Zhao

Wang

et al. 2022

ACS Appl. Mater. Interfaces

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“…Light propagation control using photonic crystals with periodically repeating dielectric structures has attracted considerable research interest for various photonic applications, such as color excitation, [1][2][3][4][5] imaging, [6][7][8][9] lasers, [10][11][12] and optical sensors. [13][14][15][16] Using a sophisticated nanopatterning process to repeat periodic spatial arrangements in dielectric materials, artificial 1D, [17][18][19][20][21] 2D, [22][23][24] and 3D [25][26][27] photonic forbidden band structures [28][29][30][31][32] can be obtained. However, colored light propagation control is found in various natural self-organized dielectric nano-periodic structures with large areas, in contrast to artificial nanophotonic structures with limited scalability; these naturally occurring structures can also control their photonic wavelength.…”

Section: Introductionmentioning

confidence: 99%

Color‐Tuning Mechanism of Electrically Stretchable Photonic Organogels

et al. 2022

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In contrast to nano‐processed rigid photonic crystals with fixed structures, soft photonic organic hydrogel beads with dielectric nanostructures possess advanced capabilities, such as stimuli‐responsive deformation and photonic wavelength color changes. Recenlty, advanced from well‐investigated mechanochromic method, an electromechanical stress approach is used to demonstrate electrically induced mechanical color shifts in soft organic photonic hydrogel beads. To better understand the electrically stretchable color change functionality in such soft organic photonic hydrogel systems, the electromechanical wavelength‐tuning mechanism is comprehensively investigated in this study. By employing controllable electroactive dielectric elastomeric actuators, the discoloration wavelength‐tuning process of an electrically stretchable photonic organogel is carefully examined. Based on the experimental in‐situ response of electrically stretchable nano‐spherical polystyrene hydrogel beads, the color change mechanism is meticulously analyzed. Further, changes in the nanostructure of the symmetrically and electrically stretchable organogel are analytically investigated through simulations of its hexagonal close‐packed (HCP) lattice model. Detailed photonic wavelength control factors, such as the refractive index of dielectric materials, lattice diffraction, and bead distance in an organogel lattice, are theoretically studied. Herein, the switcing mechanism of electrically stretchable mechanochromic photonic organogels with photonic stopband‐tuning features are suggested for the first time.

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“…Up to now, research studies on photonic crystals (PCs) have not only involved the physical theory of the interaction between optical waves and materials − or the manufacture technology of photonic crystal materials in a large scale − but also the development of stimuli-responsive photonic crystals with dynamic structural colors . Among various stimuli-responsive photonic crystals for constructing smart devices, electrochromic photonic crystals (ECPCs) have become one of the most promising optical active materials because of their convenient regulation approach, continuous color-switching, rapid response, and potential for easy integration into electronic devices.…”

Section: Introductionmentioning

confidence: 99%

In Situ Dynamic Study of Color-Changing in Liquid Colloidal Crystals for Electrophoretic Displays

Fang

Wang

et al. 2022

ACS Appl. Nano Mater.

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Reflective display devices, especially for electrochromic photonic crystals (ECPCs), are of great interest to researchers due to their convenient control approach, wide color regulation range, fast response, and low power consumption. Herein, liquid colloidal crystals (LCCs) of SiO2 nanospheres were prepared through an evaporation-induced self-assembly method and used as a reflective unit for fabricating dynamic ECPC devices. The ECPC device exhibited brilliant controllable structural color across the visible spectrum under low voltages (<3.5 V). Based on the in situ ultra-small-angle X-ray scattering results and reflective spectra, regulatory rules of the dynamic ECPC device concerning a color tunable range, reflectance intensity, response speed, and cyclic performance were set up, and the relationship between slurry concentration, electrode spacing, and viewing angle was established. Furthermore, a dynamic mechanism was revealed for explaining the responsive behaviors of reflection spectra during the electrical modulation, which is significant for the development of ECPC devices in the future. Based on the parameter optimization and structure design of the dynamic ECPC device, a pressure-responsive electrochromic prototype device was constructed with rapid response, dynamic structural color, and good reversibility, which demonstrated its great potential in reflective display units and multifunctional sensors.

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Polychrome photonic crystal stickers with thermochromic switchable colors for anti-counterfeiting and information encryption

Cited by 42 publications

References 67 publications

Reversible Photochromic Photonic Crystal Device with Dual Structural Colors

Reversible Photochromic Photonic Crystal Device with Dual Structural Colors

Color‐Tuning Mechanism of Electrically Stretchable Photonic Organogels

In Situ Dynamic Study of Color-Changing in Liquid Colloidal Crystals for Electrophoretic Displays

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