Circularly Polarized Luminescence of Cholesteric Liquid Crystal Polymer Networks with a Europium(III) Complex as an Emitter DOI

Li-Ting Xu,

Fengyun Shi,

Jinghua Zhao

et al.

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 16(12), P. 15242 - 15250

Published: March 14, 2024

A coordination complex, Eu(C12C12dbm)3(phen), with strong emission and a high quantum yield (QY ∼ 51.9%) was synthesized. The EuIII as fluorescent emitter, embedded in cholesteric liquid crystal polymer networks (CLCNs). series of free-standing EuIII-CLCN films were obtained, generating typical sharp band corresponding to the complex. Tunable handedness circularly polarized luminescence (CPL) |glum| values (up 0.63) observed. CPL-active CLCN-coated PET also prepared (|glum| up 0.63), which can be used for large-area preparations. Moreover, by stacking an emitter-embedded PMMA layer CLCN layer, composite system built, large value (∼1.42) achieved. Fluorescence patterns prepared, distinct images recognized under both daylight UV light. This work not only demonstrated that compounds could incorporated prepare materials but provided new perspective emissive anticounterfeiting encryption.

Language: Английский

Helically Chiral Hybrid Cyclodextrin Metal–Organic Framework Exhibiting Circularly Polarized Luminescence DOI
Masoud Kazem‐Rostami, Ángel Orte,

Ana M. Ortuño

et al.

Journal of the American Chemical Society, Journal Year: 2022, Volume and Issue: 144(21), P. 9380 - 9389

Published: May 20, 2022

Three achiral polycyclic aromatic fluorophores─namely, 1-pyrenecarboxylic acid, 9-anthracenecarboxylic and perylene-3,9-dicarboxylic acid─were chosen based on their desired properties before being incorporated into the construction of a K+-carrying gamma-cyclodextrin (γ-CD)-based metal–organic framework (CD-MOF-1) γ-CD-containing hybrid frameworks (CD-HFs). Among these fluorophores, only pyrene-carrying one shows significant noncovalent bonding interactions with γ-CD in solution. This fluorophore is encapsulated CD-HF trigonal superstructure instead common cubic CD-MOF-1 found case other two fluorophores. Single-crystal X-ray diffraction analysis reveals π-stacked chiral positioning inside (γ-CD)2 tunnels held uniformly around an enantiomorphous 32 screw axis along c direction solid-state structure. helix-like structure demonstrates additional level chirality over above point-chiral stereogenic centers axial associated self-assembled These arrangements result specifically generated photophysical chiroptical properties, such as controlled emergence circularly polarized luminescence (CPL) emission. In this manner, complete understanding mechanism transfer from host (CD-HF) to has been achieved, attribute which often missing development materials CPL.

Language: Английский

Citations

71
Circularly polarized luminescence polymers: From design to applications DOI
Shijie Yang,

Shu-Ming Zhang,

Fengqing Hu

et al.

Coordination Chemistry Reviews, Journal Year: 2023, Volume and Issue: 485, P. 215116 - 215116

Published: March 28, 2023

Language: Английский

Citations

51
Luminescent Radicals DOI
Asato Mizuno, Ryota Matsuoka, Takuto Mibu

et al.

Chemical Reviews, Journal Year: 2024, Volume and Issue: 124(3), P. 1034 - 1121

Published: Jan. 17, 2024

Organic radicals are attracting increasing interest as a new class of molecular emitters. They demonstrate electronic excitation and relaxation dynamics based on their doublet or higher multiplet spin states, which different from those singlet–triplet manifolds conventional closed-shell molecules. Recent studies have disclosed luminescence properties excited state unique to radicals, such highly efficient electron–photon conversion in OLEDs, NIR emission, magnetoluminescence, an absence heavy atom effect, spin-dependent spin-selective dynamics. These difficult sometimes impossible achieve with luminophores. This review focuses luminescent organic emerging photofunctional system, introduces the material developments, fundamental including luminescence, photofunctions. Materials covered this range monoradicals, radical oligomers, polymers metal complexes ligands demonstrating radical-involved emission. In addition stable transiently formed generated situ by external stimuli introduced. shows that great potential expand chemical spaces materials thus broaden applicability systems.

Language: Английский

Citations

47
When quantum dots meet blue phase liquid crystal elastomers: visualized full-color and mechanically-switchable circularly polarized luminescence DOI Creative Commons
Shan Li, Yuqi Tang,

Qingyan Fan

et al.

Light Science & Applications, Journal Year: 2024, Volume and Issue: 13(1)

Published: June 14, 2024

Abstract Polymer-based circularly polarized luminescence (CPL) materials with the advantage of diversified structure, easy fabrication, high thermal stability, and tunable properties have garnered considerable attention. However, adequate precise tuning over CPL in polymer-based remains challenging due to difficulty regulating chiral structures. Herein, visualized full-color is achieved by doping red, green, blue quantum dots (QDs) into reconfigurable phase liquid crystal elastomers (BPLCEs). In contrast signal observed cholesteric (CLCEs), 3D cubic superstructure BPLCEs induces an opposite signal. Notably, this effect entirely independent photonic bandgaps (PBGs) results a g lum value, even without matching between PBGs emission bands QDs. Meanwhile, lattice structure can be reversibly switched via mechanical stretching force, inducing on-off switching signals, these variations further fixed using dynamic disulfide bonds BPLCEs. Moreover, smart systems for anti-counterfeiting information encryption been demonstrated, suggesting great potential BPLCEs-based active materials.

Language: Английский

Citations

34
Tunable Circularly Polarized Luminescence from Inorganic Chiral Photonic Crystals Doped with Quantum Dots DOI

Xuekang Yang,

Jiawei Lv, Jing Zhang

et al.

Angewandte Chemie International Edition, Journal Year: 2022, Volume and Issue: 61(29)

Published: May 2, 2022

Chiral semiconductor nanostructures have received enormous attention due to their emerging circularly polarized luminescence (CPL) properties. However, compared with well-studied photoluminescence (PL), the reported CPL is much weaker and more challenging be modulated. Herein, we describe a new approach for acquiring intense tunable from inorganic chiral photonic crystals (CPCs) doped quantum dots (QDs). Unprecedentedly, sign, position intensity of peaks can precisely controlled by manipulating either band gap CPCs or wavelength QDs giant absolute dissymmetry factor |glum | up 0.25 obtained. More importantly, origin modulation clearly elucidated both experiment theory. This work lays foundation construction next-generation high-performance CPL-based devices.

Language: Английский

Citations

62
Recent Progress in Functional Dye‐Doped Liquid Crystal Devices DOI
Wenbo Shen, Huimin Zhang, Zongcheng Miao

et al.

Advanced Functional Materials, Journal Year: 2022, Volume and Issue: 33(6)

Published: Dec. 9, 2022

Abstract As a typical representative of dopants, organic functional dyes have demonstrated their significant roles in novel smart liquid crystal (LC) devices, and dye‐doped LCs also been source inspiration for scientists to design fabricate stimuli‐gated materials or devices envisioned applications wide range areas. In this review, the focus on dichroic dyes, fluorescent photothermal recent progress LC employing these as dopants are overviewed. The review highlights developments doped with dyes. structures, designs, outlined. underlying principles which utilized first introduced. Subsequently, application fields windows, attenuators augmented reality (AR) systems, color‐changeable textiles, color filters, dual‐mode circular polarizers, chirality detectors, optical limiters, switchable luminescent solar concentrators, multiple information encryption, anti‐counterfeiting, photo‐addressed transparent displays, circularly polarized luminescence, tunable lasers, light‐driven soft actuators discussed. Finally, challenge strategies future improvement

Language: Английский

Citations

56
Exploring the Circular Polarization Capacity from Chiral Cellulose Nanocrystal Films for a Photo‐Controlled Chiral Helix of Supramolecular Polymers DOI
Mingcong Xu, Guangyao Li, Wei Li

et al.

Angewandte Chemie International Edition, Journal Year: 2022, Volume and Issue: 61(18)

Published: Feb. 8, 2022

Abstract Circularly polarized light (CPL) is key to asymmetric photochemistry as it could impart the chiral organization information into chemical products. Here, we demonstrate circular polarization capacity of cellulose nanocrystal (CNC) films trigger photo‐alignment achiral supramolecular polymers helical structures. Right‐handed transmitted (T‐) CPL was generated from self‐assembled CNC films, which induced amorphous azobenzene (Azo) The induction effect T‐CPL enhanced on Azo with longer spacers. absorptive dissymmetry factor ( g abs ) values liquid‐crystal can be amplified significantly (over 10 times) after irradiation. Moreover, by integrating carbon dots emission a considerable luminescence lum up −0.66 achieved, and used for high chiroptical properties. This work provides new insight photo modulation CPL‐active materials.

Language: Английский

Citations

52
Advances in circularly polarized luminescent materials based on axially chiral compounds DOI
Shipeng Wan, Haiyan Lu, Meng Li

et al.

Journal of Photochemistry and Photobiology C Photochemistry Reviews, Journal Year: 2022, Volume and Issue: 50, P. 100500 - 100500

Published: March 1, 2022

Language: Английский

Citations

50
Chiral Mesostructured Inorganic Materials with Optical Chiral Response DOI
Yingying Duan, Shunai Che

Advanced Materials, Journal Year: 2022, Volume and Issue: 35(51)

Published: Oct. 17, 2022

Fabricating chiral inorganic materials and revealing their unique quantum confinement‐determined optical responses are crucial tasks in the multidisciplinary fields of chemistry, physics, biology. The field mesostructured started from synthesis individual nanocrystals evolved to include assembly metals, semiconductors, ceramics, salts endowed with various structures ranging atomic micron scales. This tutorial review highlights recent research on materials, especially novel expression chirality response, it may inspire us new strategies for design opportunities beyond traditional applications chirality. Fabrication methods classified according type, scale, symmetry‐breaking mechanism. Special attention is given highlight systems original discoveries, exceptional phenomena, or mechanisms response left‐ right‐handedness.

Language: Английский

Citations

48
Turn-On Mode Circularly Polarized Luminescence in Self-Organized Cholesteric Superstructure for Active Photonic Applications DOI
Siyang Lin, Shuangshuang Zeng, Ziyuan Li

et al.

ACS Applied Materials & Interfaces, Journal Year: 2022, Volume and Issue: 14(26), P. 30362 - 30370

Published: June 27, 2022

Developing circularly polarized luminescence (CPL)-active materials with a large dissymmetry factor (glum) or stimulus responses has evoked lot of interest in the past few years; however, light-controllable "on/off" CPL still remains challenge. Here, novel diarylethene-based chiral fluorescent photoswitch featuring "turn-on" characteristic is developed, designated as (S,S)-switch 6, which can undergo reversible photocyclization/cycloreversion upon irradiation UV and visible light. (S,S)-Switch 6 shows completely "off-on-off"-responsive behavior solution. By doping into nematic liquid crystals (LCs), consequent luminescent cholesteric LCs (CLCs) exhibit larger glum value enhanced 2 orders magnitude when irradiated light, be attributed to highly ordered helical arrangement CLCs. The potentials this turn-on type material for anticounterfeiting information encryption are illustrated. Furthermore, visualization (CP) patterns successfully achieved by constructing double-layer system consisting CP layer polymer reflective layer. proposed concept establishes light-controlled off-on-off platform that tremendous potential applications multi-informational data storage devices.

Language: Английский

Citations

45