Liquid Crystal Assembly for Ultra-dissymmetric Circularly Polarized Luminescence and Beyond

Journal of the American Chemical Society, Год журнала: 2023, Номер 145(24), С. 12951 - 12966

Опубликована: Июнь 5, 2023

Circularly polarized luminescence (CPL) is attracting much interest because it can carry extensive optical information. CPL shows left- or right-handedness and be regarded as part of high-level visual perception to supply an extra dimension information with regard regular light. A key meeting the needs for practical applications develop emerging field ultra-dissymmetric CPL. Chiral liquid crystal (LC) assemblies─otherwise referred cholesteric crystals (CLCs)─are essentially organized helical superstructures a highly ordered one-dimensional orientation, distinctly superior supramolecules. CLCs achieve perfect equilibrium molecular short-range interaction long-range orientational order, enabling molecule-scale chirality on pitch observable scale. LC assembly could ideal strategy amplifying chirality, making accessible Herein, we focused some basic but important issues regarding CPL: (i) How created from chiral dyes? (ii) Is luminescent dyes essential factor generation CPL? That is, all emit vice versa? (iii) transferred within intermolecular systems, what principles transmission should followed? Given these queries our work, in this Perspective discuss generation, transmission, modulation assembly, aiming design build up novel chiroptical materials. Recent CPL-active microstructures three-dimensional displays, circularly lasers, asymmetric catalysis are also discussed.

Язык: Английский

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A Photo‐ and Thermo‐Driven Azoarene‐Based Circularly Polarized Luminescence Molecular Switch in a Liquid Crystal Host

Angewandte Chemie International Edition, Год журнала: 2023, Номер 62(48)

Опубликована: Авг. 31, 2023

The development of chiral optical active materials with switchable circularly polarized luminescence (CPL) signals remains a challenge. Here an azoarene-based molecular switch, (S, R, S)-switch 1 and (R, R)-switch 2, are designed prepared (R)-binaphthyl azo group as photosensitive moiety two (S)- or fluorescent molecules opposite the same handedness moieties. Both switches exhibit reversible trans/cis isomerization when irradiated by 365 nm UV light 520 green in solvent liquid crystal (LC) media. In contrast control switch is doped into nematic LCs, polarization inversion switching-off CPL achieved resultant helical superstructure upon irradiation light, respectively. Meanwhile, fluorescence intensity system basically unchanged during this switching process. particular, these variations could be recovered after heating, realizing true sense switching. Taking advantage unique switching, proof-of-concept for "a dual-optical information encryption system" based on above material demonstrated.

Язык: Английский

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Mechanically Tunable Circularly Polarized Luminescence of Liquid Crystal‐Templated Chiral Perovskite Quantum Dots

Angewandte Chemie International Edition, Год журнала: 2024, Номер 63(22)

Опубликована: Март 25, 2024

Abstract Endowing perovskite quantum dots (PQDs) with circularly polarized luminescence (CPL) offers great promise for innovative chiroptical applications, but the existing strategies are inefficient in acquiring stimuli‐responsive flexible chiral films large, tunable dissymmetry factor ( g lum ) and long‐term stability. Here, we report a strategy design synthesis of luminescent cholesteric liquid crystal elastomer (Lumin‐CLCE) mechanically CPL, which is enabled by crystal‐templated self‐assembly situ covalent cross‐linking judiciously designed photopolymerizable CsPbX 3 (X=Cl, Br, I) PQD nanomonomers into elastic polymer networks. The resulting Lumin‐CLCE showcase structural color natural light noticeable CPL maximum value up to 1.5 under UV light. manipulation intensity rotation direction achieved controlling self‐assembled helicoidal nanostructure handedness soft helices. A significant breakthrough lies achievement reversible, perovskite‐based switch activated biaxial stretching, enables flexible, dynamic anti‐counterfeiting labels capable decrypting preset information specific polarization states. This work can provide new insights development advanced materials their emerging applications encryption, 3D displays, beyond.

Язык: Английский

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Helical-caging enables single-emitted large asymmetric full-color circularly polarized luminescence

Nature Communications, Год журнала: 2024, Номер 15(1)

Опубликована: Янв. 4, 2024

Abstract Colorful circularly polarized luminescence materials are desired for 3D displays, information security and asymmetric synthesis, in which single-emitted ideal owing to self-absorption avoidance, evenly entire-visible-spectrum-covered photon emission facile device fabrication. However, restricted by the synthesis of chiral broad-luminescent emitters, realization application high-performing full-color is its infancy. Here, we disclose a system (spiral generator), composed whole-vis-spectrum emissive quantum dots liquid crystals. The achieves maximum dissymmetry factor 0.8 remains an order 10 −1 visible region tuning photonic bandgap. We then expand it series customized-color luminescence, build devices further demonstrate working scenario photoinduced enantioselective polymerization. This work contributes design efficient chiroptical materials, fabrication synthesis.

Язык: Английский

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Multiple degrees‐of‐freedom programmable soft‐matter‐photonics: Configuration, manipulation, and advanced applications

Deleted Journal, Год журнала: 2024, Номер 2(1)

Опубликована: Фев. 1, 2024

Abstract For centuries, humans have never stopped exploring the nature of light and manipulating it, since carries multiple information through its intrinsic wave‐particle dualism, including wavelength, amplitude, phase, polarization, spin/orbital angular momentum, etc., which determines physical language basic manners we perceive objective world. Conventional optical devices, such as lenses, prisms, lasers, are composed solid elements that bulky, making it difficult to manipulate dynamically with degrees‐of‐freedom. Comparatively, some responsive soft matters, especially represented by liquid crystals (LCs), possess distinctive orientational order spontaneous self‐assembled superstructures, enabling digital programming microstructures degrees‐of‐freedom manipulation their characteristics. The based on these is, “soft‐matter‐photonics”, is playing an impressive role in integrated functional present age explosion. Herein, review latest advances, respectively, microstructure configurations, manipulations, relevant prospective applications. Additionally, scientific issues technical challenges hinder programing operation manipulations discussed. Toward a four‐dimensional condensed matter, this may wide implications variety applications, fabrication compact elements, multi‐channel processing high‐capacity communications.

Язык: Английский

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Light‐Driven Sign Inversion of Circularly Polarized Luminescence Enabled by Dichroism Modulation in Cholesteric Liquid Crystals

Advanced Materials, Год журнала: 2024, Номер 36(16)

Опубликована: Янв. 12, 2024

Stimuli-responsive circularly polarized luminescence (CPL) materials show great promise in applying information encryption and anticounterfeiting. Herein, light-driven CPL sign inversion is achieved by combining a photoresponsive achiral negative dichroic dye (KG) static positive (NR) as dopants at the 0.5:0.5 weight ratio into cholesteric liquid crystal (CLC) host. The side chains of KG undergo trans/cis isomerization after 365 nm UV light irradiation, leading to dichroism (S

Язык: Английский

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Reversible Handedness Inversion and Circularly Polarized Light Reflection Tuning in Self‐Organized Helical Superstructures Using Visible‐Light‐Driven Macrocyclic Chiral Switches

Angewandte Chemie International Edition, Год журнала: 2022, Номер 62(8)

Опубликована: Дек. 13, 2022

A series of macrocyclic azobenzene-based chiral photoswitches have been judiciously designed, synthesized, and characterized. In the molecular structures, binaphthyl is covalently linked to ortho-positions azobenzene, four different substituents are 6,6'-positions binaphthyl. The show enhanced helical twisting power (HTP) when doping in commercially available achiral liquid crystals form self-organized superstructures, i.e., cholesteric (CLCs). All exhibit reversible photoisomerization driven by visible light wavelengths both organic solvent crystals. with shorter enable handedness inversion CLCs upon photoisomerization. These first examples ortho-linked that CLCs. longer display only HTP values decreasing while maintaining same handedness.

Язык: Английский

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Recyclable soft photonic crystal film with overall improved circularly polarized luminescence

Nature Communications, Год журнала: 2023, Номер 14(1)

Опубликована: Сен. 30, 2023

Existing circularly polarized luminescence materials can hardly satisfy the requirements of both large dissymmetry factor and high luminescent quantum yield, which hinders their practical applications. Here, we present a soft photonic crystal film embedded with chiral nanopores that possesses excellent performance as well yield when loaded various dyes. Benefitting from retention imprinted liquid arrangement, not only endow dyes properties, but also effectively avoid severe aggregation guest dye molecules. More importantly, be recycled many times by loading eluting molecules while retaining good stability performance, enabling applications, including smart windows, multi-color anticounterfeiting.

Язык: Английский

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Circularly Polarized Room Temperature Phosphorescence of Chiral Bromoxanthone Using a Chiral Self‐Assembled Liquid Crystal Polymer Frameworks

Advanced Optical Materials, Год журнала: 2024, Номер 12(15)

Опубликована: Фев. 5, 2024

Abstract Chiral self‐assembly has often been found to be an efficient strategy for the development of high‐performance circularly polarized luminescent (CPL) materials, through regulation ordered helical superstructure blocks in liquid crystal media. Here, design and synthesis two pairs axially chiral emitters (BBXT‐3‐Br BOHXT‐3‐Br) are reported based on bromoxanthone. And self‐assembled polymer (LCP) framework (PRM257) is demonstrated by mixing with monomer (RM257) thermal annealing photoinitiated polymerization. Both BBXT‐3‐Br@PRM257 BOHXT‐3‐Br@PRM257 exhibited excellent room temperature phosphorescence (RTP) properties. In addition, enantiomers showed afterglow average lifetime ( τ ) 162.41 ms emitted blue CPL λ em = 450 nm, Φ FL 1.3%, | g 0.071), although weak RTP (CP‐RTP) observed. Interestingly, a less conjugated system emits red 98.83 ms) also intense CP‐RTP 612 Phos 0.45%, 0.057).

Язык: Английский

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Light-triggered fluorochromic cholesteric liquid crystal elastomer with hydrogen-bonded fluorescent switch: dualmodal-switchable circularly polarized luminescence

Science China Chemistry, Год журнала: 2024, Номер 67(8), С. 2719 - 2727

Опубликована: Июль 1, 2024

Язык: Английский

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