Simultaneous optical tuning of reflection and fluorescence in a self-organized simple 3D cubic structure by <i>α</i>-cyanodiarylethene-based chiral fluorescence photoswitches

Wang, Jingjing; He, Yanrong; Li, Shan; Fan, Qingyan; Guo, Jinbao

doi:10.1039/d3tc02692b

Cited by 10 publications

(1 citation statement)

References 50 publications

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“…Duan et al innovatively merged fluorescent dyes with blue-phase liquid crystals, intensifying the vibrancy of the coating’s colors. Going a step further, Wang et al integrated chiral fluorescence photoswitches as chiral fluorescent switches, enabling adjustments in fluorescent intensity and facilitating repeated information erasure. Yet, these efforts have not realized multidimensional information encryption.…”

Section: Introductionmentioning

confidence: 99%

Light and Humidity Dual-Responsive Anti-Counterfeiting Films Based on Hydrogen-Bonded Cholesteric Liquid Crystal Polymers with Spiropyran

Xu,

Li,

Zhou

et al. 2023

ACS Appl. Mater. Interfaces

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Section: Introductionmentioning

confidence: 99%

Light and Humidity Dual-Responsive Anti-Counterfeiting Films Based on Hydrogen-Bonded Cholesteric Liquid Crystal Polymers with Spiropyran

Xu,

Li,

Zhou

et al. 2023

ACS Appl. Mater. Interfaces

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Cholesteric Liquid Crystal Polymer Networks Doped with an Axially Chiral Fluorescent Dye: Circularly Polarized Luminescence and Anti‐Counterfeiting Applications

Yang,

Zhao,

Liu

et al. 2024

Advanced Optical Materials

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Circularly polarized luminescence (CPL) of chiral luminescent materials has gained increasing attention because of their significant applications in 3D displays, chiral optoelectronics, anti‐counterfeiting, and encryption. A strongly emissive chiral dye BAcT is synthesized using (R)‐BINOL as the chiral source and a tetraphenylethene group as the fluorophore. Upon the addition of BAcT to the nematic liquid crystal, a left‐handed cholesteric structure is induced. Different concentrations of R/S5011 as chiral co‐dopants are added to prepare a series of structurally colored cholesteric liquid crystal polymer network (CLCN) films. CPL bands are detected for these green emissive CLCN films, and relatively high |glum| values (up to 0.48) are obtained. Furthermore, a fluorescent PMMA‐BAcT layer is prepared by embedding the dye in the PMMA matrix and stacked with a CLCN layer to construct a composite film. Because of the chiral filtering effect of the CLCN film, a high |glum| value up to 1.41 is successfully achieved. Colorful CLCN patterns are prepared, and clear pictures are observed in both reflective and fluorescent modes, contributing to optical anti‐counterfeiting with enhanced security. This work not only provides a deeper understanding of CPL, but also establishes a practical strategy to prepare colorful CLCN patterns for anti‐counterfeiting using inkjet printing technology.

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A Halogen‐Bonded Fluorescent Molecular Photoswitch: Transition from 3D Cubic Lattice to 1D Helical Superstructure for Polarization Inversion of Circularly Polarized Luminescence

Li,

Wang,

Tian

et al. 2024

Angewandte Chemie

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The fabrication of materials that can switch between circularly polarized luminescence (CPL) signals is both essential and challenging. Here, two new halogen‐bonded fluorescent molecular photoswitches, namely, HB‐switch 1 and HB‐switch 2, containing α‐cyano‐substituted diarylethene compounds with different end groups were developed. Upon exposure to specific UV or visible light wavelengths, they exhibited controllable and reversible Z/E photoisomerization. When these switches were integrated into blue‐phase liquid crystals (BPLCs), the temperature range of BP significantly expanded. Notably, the BP system incorporating HB‐switch 1 exclusively achieved reversible polarization inversion of CPL signals under specific UV/visible light irradiation and during cooling/heating. The photo/thermal dual‐response behavior of the CPL signals can be attributed to the phase transition from a high‐symmetry 3D BP I lattice to a low‐symmetry 1D helical superstructure induced by the Z/E photoisomerization of HB‐switch 1 and temperature changes. This study underscores the significance of employing halogen‐bond assembly strategies to design materials with switchable CPL signals, opening new possibilities for CPL‐active systems.

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Simultaneous optical tuning of reflection and fluorescence in a self-organized simple 3D cubic structure by α-cyanodiarylethene-based chiral fluorescence photoswitches

Abstract: Simultaneous phototuning of reflection and fluorescence in blue-phase liquid crystals (BPLC) based on chiral fluorescence photoswitches was demonstrated. Firstly, two novel α-cyanodiarylethene-based chiral fluorescence photoswitches with excellent photoresponsive performances and...

Cited by 10 publications

References 50 publications

Light and Humidity Dual-Responsive Anti-Counterfeiting Films Based on Hydrogen-Bonded Cholesteric Liquid Crystal Polymers with Spiropyran

Light and Humidity Dual-Responsive Anti-Counterfeiting Films Based on Hydrogen-Bonded Cholesteric Liquid Crystal Polymers with Spiropyran

Cholesteric Liquid Crystal Polymer Networks Doped with an Axially Chiral Fluorescent Dye: Circularly Polarized Luminescence and Anti‐Counterfeiting Applications

A Halogen‐Bonded Fluorescent Molecular Photoswitch: Transition from 3D Cubic Lattice to 1D Helical Superstructure for Polarization Inversion of Circularly Polarized Luminescence

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