Frontiers in circularly polarized luminescence: molecular design, self-assembly, nanomaterials, and applications

Science China Chemistry, Journal Year: 2021, Volume and Issue: 64(12), P. 2060 - 2104

Published: Nov. 10, 2021

Language: Английский

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Fluorescent TPE Macrocycle Relayed Light-Harvesting System for Bright Customized-Color Circularly Polarized Luminescence

Journal of the American Chemical Society, Journal Year: 2022, Volume and Issue: 144(12), P. 5389 - 5399

Published: March 18, 2022

Artificial systems for sequential chirality transmission/amplification and energy relay are perpetual topics that entail learning from nature. However, engineering chiral light-harvesting supramolecular remains a challenge. Here, we developed new with Förster resonance transfer process where designed blue-violet-emitting BINOL (1,1'-Bi-2-naphthol) compound, BINOL-di-octadecylamide (BDA), functions as an initiator of light absorbance, green-emitting hexagonal tetraphenylethene-based macrocycle (TPEM) aggregation-induced emission serves conveyor, Nile red (NiR) or/and near-infrared dye, tetraphenylethene (TPE)-based benzoselenodiazole (TPESe), the terminal acceptors. Benefiting close contact large optical overlap between donors acceptors at each level, triad tetrad relaying sequentially efficiently furnish along cascaded line BDA-TPEM-NiR (or/and TPESe), leading to bright customized-color circularly polarized luminescence (CPL) white-light-emitting CPL (CIE coordinates: 0.33, 0.34) amplified dissymmetry factor (glum) 3.5 × 10-2 over wide wavelength range. This work provides direction construction broad range applications in chiroptical physics chemistry.

Language: Английский

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Chiral-Induced Ultrathin Covalent Organic Frameworks Nanosheets with Tunable Circularly Polarized Luminescence

Journal of the American Chemical Society, Journal Year: 2022, Volume and Issue: 144(16), P. 7245 - 7252

Published: April 1, 2022

Development of covalent organic frameworks (COFs) with circularly polarized luminescence (CPL) is still challenging. Here we first reported ultrathin COFs nanosheets (NS) based CPL materials using a chiral induced-synthesis strategy. Chiral amines served as inducers to give COF TpBpy chirality and participated in the modification TpBpy, inhibiting fluorescence quenching caused by π-π stacking form luminescent (chirCOFs) NS. The obtained chirCOFs R-/S-TpBpy NS had strong intense red property |glum| ∼0.02. Afterward, carboxyl containing green blue fluorescent dye molecules were postmodified onto (chirCOFs/Dyes) achieve color-adjustable CPL. Due energy transfer between groups, chirCOFs/Dyes showed increased tunable photoluminescence, exhibiting excellent, tunable, amplified performance maximum ∼0.1, which was ∼5 times stronger than that as-prepared Moreover, corresponding dispersed into polydimethylsiloxane (PDMS) matrix wafer size, highly transparent, flexible COFs/PDMS films for practical application. This study opens new strategy prepare induction provides approach preparation large composite optical applications.

Language: Английский

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Circularly polarized luminescence of coordination aggregates

Aggregate, Journal Year: 2022, Volume and Issue: 3(5)

Published: Feb. 11, 2022

Abstract The development and applications of materials with efficient circularly polarized luminescence (CPL) have become an interdisciplinary frontier research topic. We summarize herein the recent advance in CPL‐active aggregates based on metal‐ligand coordination (termed as “coordination aggregates”). surveyed are classified small‐molecular metal complexes, which include monocomponent assemblies Pt(II) complexes other binary helicates, polymers, frameworks. efforts improving dissymmetry factors quantum yields these use aggregation strategy enhancing performance isolated molecules discussed. chiral organic light‐emitting diodes (OLEDs) solution‐ or evaporation‐processed procedures surveyed. In addition, uses lanthanide CPL‐contrast imaging CPL probes highlighted. common discussion mechanism aggregation‐enhanced CPLs a perspective future works finally given.

Language: Английский

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“Matching Rule” for Generation, Modulation and Amplification of Circularly Polarized Luminescence

Accounts of Chemical Research, Journal Year: 2024, Volume and Issue: 57(8), P. 1188 - 1201

Published: April 5, 2024

ConspectusCircularly polarized luminescence (CPL) generated by chiral luminescent systems has sparked enormous attention in multidisciplinary field as it brings infinite potential for applications, such 3D optical displays, biological probes, and chiroptical sensors. Satisfying both the conditions of chirality (including fluorescence or phosphorescence) is a prerequisite constructing CPL materials. In this regard, whether organic, inorganic, hybrid systems, components generally involve effective coupling through covalent noncovalent bonds. For interactions, copolymerization monomers, although bonds provide high stability system, they inevitably tedious preparation procedures that connect together. bonds, take supramolecular assembly an example, elements achiral light-emitting units are transferred intermolecular their advantages include diversity building blocks, stimuli responsiveness brought well amplification signals coassembly. However, system may be poor, performance morphology difficult to predict. Gratifyingly, matching rule do not rely on together with interactions allows effortless construction, modulation, systems.In Account, we overview different strategies based rule, including fluorescence-selective absorption, circularly reflection, energy transfer (CPF-ET). Examples these illustrated focus helical polymers light appealing structures wide uses. instance, can convert racemic into one specific handedness simply overlapping polymer's circular dichroism (CD) spectra luminophore's emission spectra. employing selective reflection certain handedness's light, twisting power (HTP) polymer cholesteric liquid crystals (N*-LCs) gives glum. Additionally, CPF-ET, only spectrum donor absorption (or excitation) acceptor required overlap, no between two required. An outlook materials related which will avail optimization extension intriguing approach concludes Account. We hope Account offer insightful inspiration flourishing progress present exciting opportunities.

Language: Английский

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

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: Jan. 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.

Language: Английский

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Enabling robust blue circularly polarized organic afterglow through self-confining isolated chiral chromophore

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: April 9, 2024

Abstract Creating circularly polarized organic afterglow system with elevated triplet energy levels, suppressed non-radiative transitions, and effective chirality, which are three critical prerequisites for achieving blue afterglow, has posed a formidable challenge. Herein, straightforward approach is unveiled to attain materials by covalently self-confining isolated chiral chromophore within polymer matrix. The formation of robust hydrogen bonds the matrix confers distinctly stabilized molecular state chromophores, endowing emission band at 414 nm, lifetime 3.0 s, luminescent dissymmetry factor ~ 10 −2 . Utilizing synergistic chirality transfer, full-color systems endowed doping colorful fluorescent molecules into designed polymers, empowering versatile applications. This work paves way streamlined design materials, expanding horizons various domains.

Language: Английский

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Circularly Polarized White Organic Light‐Emitting Diodes Based on Spiro‐Type Thermally Activated Delayed Fluorescence Materials

Angewandte Chemie International Edition, Journal Year: 2022, Volume and Issue: 61(23)

Published: March 10, 2022

In this study, we report the first circularly polarized white organic light-emitting diodes (CP-WOLEDs) based on all thermally activated delayed fluorescence (TADF) materials. Two pairs of spiro-type TADF enantiomers, (R/S)-SPOCN (5,5'-((2,2',3,3'-tetrahydro-1,1'-spirobi[indene]-7,7'-diyl)bis(oxy))bis(4-(10H-phenoxazin-10-yl)phthalonitrile)) and (R/S)-OSFSO (2'-(trifluoromethyl)-spiro[quinolino[3,2,1-kl]phenoxazine-9,9'-thioxanthene]-10',10'-dioxide), serve as emitters with complementary emission. The CP-OLEDs exhibit warm emission a CIE coordinate (0.35, 0.46). Besides, decent device performances are observed an external quantum efficiency up to 21.6 % at maximum 11.8 1000 cd m-2 . Obvious electroluminescence signals detected dissymmetry factor |gEL | around 3.0×10-3 This is CP-WOLEDs that can harvest both singlet triplet excitons, which provides feasible strategy for development remarkable performances.

Language: Английский

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Dynamic Circularly Polarized Luminescence with Tunable Handedness and Intensity Enabled by Achiral Dichroic Dyes in Cholesteric Liquid Crystal Medium

Advanced Materials, Journal Year: 2022, Volume and Issue: 34(28)

Published: May 10, 2022

Cholesteric liquid crystals (CLCs) are chiral supramolecular systems that self-assemble into a highly regular helical arrangement in crystal (LC) medium. Such an is beneficial for the enlargement effect on circularly polarized luminescence (CPL) signals. Dichroic dyes with rod-like molecular structures can exhibit fluorescence anisotropy along both long and short axes owing to their transition dipole moment (TDM) vectors. In this work, pair of donor-accepter (D-A) achiral dichroic prepared, namely, 3,4-ethylenedioxythiophene derivative (P1, whose TDM vector parallel axis molecule, i.e., F|| > F⊥ ) anthraquinone (N1, perpendicular < ). CLCs be fabricated by doping P1 or N1 together 1,1'-binaphthyl-derived inducers SLC1717 Dynamic CPL tunable handedness intensity achieved changing N1:P1 mass ratio, dissymmetry factor (gem value reaches |0.71|. This work describes first observation dynamic enabled regulation CLC

Language: Английский

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Visible-light-induced metal-free coupling of C(sp³)–H sources with heteroarenes

Green Chemistry, Journal Year: 2022, Volume and Issue: 24(8), P. 3056 - 3080

Published: Jan. 1, 2022

This critical review chronologically summarizes the metal-free coupling methodologies of C(sp 3 )–H sources with heteroarenes induced by visible light. The articles which are published up to January 2022 on this topic enclosed here.

Language: Английский

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