Long-Lived Organic Room-Temperature Phosphorescence from Amorphous Polymer Systems

Accounts of Chemical Research, Год журнала: 2022, Номер 55(8), С. 1160 - 1170

Опубликована: Апрель 8, 2022

Long-lived organic room-temperature phosphorescence (RTP) materials have recently drawn extensive attention because of their promising applications in information security, biological imaging, optoelectronic devices, and intelligent sensors. In contrast to conventional fluorescence, the RTP phenomenon originates from slow radiative transition triplet excitons. Thus, enhancing intersystem crossing (ISC) rate lowest excited singlet state (S1) suppressing nonradiative relaxation channels (T1) are reasonable methods for realizing highly efficient purely materials. Over past few decades, many strategies been designed on basis above two crucial factors. The introduction heavy atoms, aromatic carbonyl groups, other heteroatoms with abundant lone-pair electrons has demonstrated strengthen spin-orbit coupling, thereby successfully facilitating ISC process. Furthermore, rigid environment is commonly constructed through crystal engineering restrict intramolecular motions intermolecular collisions decrease excited-state energy dissipation. However, most crystal-based suffer poor processability, flexibility, reproducibility, becoming a thorny obstacle practical application.Amorphous polymers long-lived characteristics more competitive science. intertwined structures long chains not only ensure multiple interactions but also protect excitons surroundings, which conducive ultralong bright emission. Exploring fabrication strategies, intrinsic mechanisms, desirable remains formidable challenge. particular, polymer systems that capable dynamically responding external stimuli (e.g., light, temperature, oxygen, humidity) rarely reported. To develop multifunctional expand potential applications, great amount effort expended.This Account gives summary significant advances amorphous systems, especially smart stimulus-responsive ones, focusing construction suppress deactivation by inter/intramolecular interactions. typical mainly include hydrogen bonding, ionic covalent can change molecular electronic affect dissipation states. An in-depth understanding mechanisms an exploration excitation-dependent color-tunable, ultraviolet (UV) irradiation-activated, temperature-dependent, water-responsive, circularly polarized distinctly illustrated this Account. we propose some detailed perspectives terms design, mechanism exploration, application hope provide helpful guidance future development polymers.

Язык: Английский

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Liquid crystal-templated chiral nanomaterials: from chiral plasmonics to circularly polarized luminescence

Light Science & Applications, Год журнала: 2022, Номер 11(1)

Опубликована: Июль 14, 2022

Chiral nanomaterials with intrinsic chirality or spatial asymmetry at the nanoscale are currently in limelight of both fundamental research and diverse important technological applications due to their unprecedented physicochemical characteristics such as intense light-matter interactions, enhanced circular dichroism, strong circularly polarized luminescence. Herein, we provide a comprehensive overview state-of-the-art advances liquid crystal-templated chiral nanomaterials. The chiroptical properties touched, design principles bottom-up synthesis strategies discussed. Different functional based on liquid-crystalline soft templates, including plasmonic luminescent nanomaterials, systematically introduced, underlying mechanisms, properties, potential emphasized. This review concludes perspective emerging applications, challenges, future opportunities fascinating can not only deepen our understanding fundamentals soft-matter chirality, but also shine light development advanced toward versatile optics, biology, catalysis, electronics, beyond.

Язык: Английский

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Aggregation behaviour of pyrene-based luminescent materials, from molecular design and optical properties to application

Chemical Society Reviews, Год журнала: 2023, Номер 52(19), С. 6715 - 6753

Опубликована: Янв. 1, 2023

This review not only highlights the progress of emission and electronic behaviour new pyrene-based luminescence molecules in aggregated state, but also provides a perspective for understanding mechanism optoelectronic properties pyrenes.

Язык: Английский

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Photoprogrammable circularly polarized phosphorescence switching of chiral helical polyacetylene thin films

Nature Communications, Год журнала: 2022, Номер 13(1)

Опубликована: Дек. 21, 2022

The developments of pure organic room-temperature phosphorescence (RTP) materials with circularly polarized luminescence (CPL) have significantly facilitated the future integration and systemization luminescent material in fundamental science technological applications. Here, a type photoinduced RTP are constructed by homogeneously dispersing phosphorescent chiral helical substituted polyacetylenes into processable poly(methyl methacrylate) (PMMA) matrix. These play vital roles propagation CPL present prominently optical characteristics high absorption dissymmetric factors up to 0.029 (gabs) 0.019 (glum). oxygen consumption properties films under UV light irradiation endow dynamic chiro-optical functionality, which can leverage precisely control manipulate remarkable advantages being contactless, wireless fatigue-resistant. Significantly, distinct be used as anti-counterfeiting involving photoprogrammability.

Язык: Английский

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Supramolecular glasses with color-tunable circularly polarized afterglow through evaporation-induced self-assembly of chiral metal–organic complexes

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

Опубликована: Март 24, 2023

The fabrication of chiral molecules into macroscopic systems has many valuable applications, especially in the fields optical displays, data encryption, information storage, and so on. Here, we design prepare a serious supramolecular glasses (SGs) based on Zn-L-Histidine complexes, via an evaporation-induced self-assembly (EISA) strategy. Metal-ligand interactions between zinc(II) ion L-Histidine endow SGs with interesting circularly polarized afterglow (CPA). Multicolored CPA emissions from blue to red dissymmetry factor as high 9.5 × 10-3 excited-state lifetime up 356.7 ms are achieved under ambient conditions. Therefore, this work not only communicates bulk wide-tunable large circular polarization, but also provides EISA method for metal-organic hybrids toward photonic applications.

Язык: Английский

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Multiple Responsive CPL Switches in an Enantiomeric Pair of Perovskite Confined in Lanthanide MOFs

Advanced Materials, Год журнала: 2022, Номер 34(11)

Опубликована: Янв. 12, 2022

Circularly polarized luminescence (CPL) switches have attracted widespread attention due to their potential applications in advanced information technologies. However, the design and fabrication of solid-state multiple-responsive CPL remain challenging. Here, through self-assembly chiral metal-organic frameworks (MOFs) perovskite nanocrystals (NCs), a pair crystalline enantiomeric (P)-(+)/(M)-(-)-EuMOF⊃MAPbX3 (MA = CH3 NH3+ , X Cl- Br- I- ) adducts is prepared, where achiral MAPbBr3 NCs embedded into MOFs inherit chirality host by host-guest EuBr PbO coordination bonds, which demonstrated synchrotron-radiation-based X-ray absorption spectroscopy. The show enhanced photoluminescence quantum yield (PLQY), good thermal stability air, photoswitchable properties upon altering different UV irradiation. Based on two emission centers characteristics, reversible are realized diversity external stimuli, for example, chemicals (water /CH3 NH3 Br solution) or temperatures (room temperature/high temperature). Benefiting from extraordinary stimuli-responsive highly switchable CPL, multiple encryptions decryptions integrated with together chiroptical logic gate successfully designed. This work opens new avenue generally fabricate composite materials develops based CPL.

Язык: Английский

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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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Processable circularly polarized luminescence material enables flexible stereoscopic 3D imaging

Science Advances, Год журнала: 2023, Номер 9(43)

Опубликована: Окт. 25, 2023

Endowing three-dimensional (3D) displays with flexibility drives innovation in the next-generation wearable and smart electronic technology. Printing circularly polarized luminescence (CPL) materials on stretchable panels gives chance to build desired flexible stereoscopic displays: CPL provides unusual optical rotation characteristics achieve considerable contrast ratio wide viewing angle. However, lack of printable, intense suitable for processing hinders implementation 3D devices. Here, we report a controllable macroscopic production printable CPL-active photonic paints using designed confining helical co-assembly strategy, achieving maximum dissymmetry factor (glum) value 1.6. We print customized graphics meter-long luminous coatings these range substates such as polypropylene, cotton fabric, polyester fabric. then demonstrate textile display panel two printed sets pixel arrays based orthogonal emission, which lays an efficient framework future intelligent clothing.

Язык: Английский

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Circularly polarized luminescence in chiral orientationally ordered soft matter systems

Deleted Journal, Год журнала: 2023, Номер 1(1)

Опубликована: Июль 23, 2023

Abstract Circularly polarized luminescent (CPL) materials have received significant attention in the field of fundamental science recently. These offer substantial advancement technological applications, such as optical data storage, displays, and quantum communication. Various strategies been proposed self‐assembled consisting inorganic, organic, hybrid systems, particularly chiral orientationally ordered soft matter systems (e.g., liquid crystals (LCs) LC polymers). However, developing scientific approaches to achieve pronounced steerable circularly light emission remains challenging. Herein, we present a comprehensive review on recent development CPL based LCs, including thermotropic LCs (cholesteric bent‐core LCs), lyotropic (nanocellulose polyacetylene‐based polymers LC‐based polymers, helical nanofibers, network). In addition, mechanisms, design principles, potential applications these are systematically reviewed. This summarizes with prospect latent challenges, which can strengthen our understanding basic principles provide new insight into progress several fields, chemistry, science, optics, electronics, biology.

Язык: Английский

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Multimodal, Convertible, and Chiral Optical Films for Anti‐Counterfeiting Labels

Advanced Functional Materials, Год журнала: 2022, Номер 32(33)

Опубликована: Июнь 2, 2022

Abstract Designing a sustainable security model that carries multilevel information with numerous optical states will significantly enhance anti‐counterfeiting abilities to deter counterfeits, ranging from artworks, currencies, and foods medicines, but is enormously challenging. Herein, ambient‐friendly, large‐area, quadruple‐level, chiral luminescent materials are prepared by incorporating lanthanide complexes wrapped in poly(ethylene glycol) matrix into nematic cellulose nanocrystal (CNC) films through co‐assembly strategy. Due the regulation of structures, composite enable full‐color structural colors tunable fluorescence. Notably, brightest fluorescent film radiates right‐handed circularly polarized luminescence an asymmetric factor over −0.36, lifetime up 510 µs, absolute quantum yield 66.7%. More interestingly, fascinating chiro‐optical behavior azure khaki can be controlled polarizing filter at given 0° 90° rotation angles. This system showcases comprehensive properties bright responsive photoluminescence, quadruple convertible color, flexible solvent‐resistant abilities. CNC‐derived photonic material act as multimodal label on banknote, which greatly facilitates its development for practical applications.

Язык: Английский

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