Chiral TADF Polymers Realizing Highly‐Efficient Deep‐Red Circularly Polarized Electroluminescence Over 660 nm

Advanced Optical Materials, Год журнала: 2023, Номер 11(19)

Опубликована: Май 8, 2023

Abstract Circularly polarized electroluminescence (CPEL) from thermally activated delayed fluorescence (TADF) emitters have been widely reported in recent years. However, a universal strategy for designing deep‐red chiral TADF is still unexplored. Herein, to address the problem, pair of donor intermediates are designed and synthesized preparing emitters, two novel polymers R‐P S‐P developed through this strategy. The exhibit intense mirror‐image circularly luminescence (CPL) signals toluene dilute solution. Besides, series solution‐processed polymer light‐emitting diode (CP‐PLED) devices fabricated with . corresponding achieve persuasive performance external quantum efficiencies (EQEs) 6.2% 5.8% at wavelength 662 nm, respectively. CPEL detected dissymmetry factors (gEL) +1.6 × 10 −3 −1.7 CP‐PLED devices,

Язык: Английский

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Construction of Circular Polarized Luminescence Molecules for Intense Near Infrared OLEDs

Advanced Optical Materials, Год журнала: 2024, Номер 12(16)

Опубликована: Март 14, 2024

Abstract The exploration of organic near‐infrared (NIR) luminescence, along with circularly polarized luminescence (CPL), is vital importance due to its significance in medical and optoelectronic applications. Integrating a chiral unit into D–A molecular structure this research realized emission peaks at 744 nm, exhibiting dissymmetric factor −1.67 × 10 −3 . introduced TPA derivative not only imparts aggregation‐induced properties CPL capabilities but also induces redshift the spectrum. Consequently, fabricated NIR light‐emitting devices (OLEDs), achieve maximum electroluminescent 748 nm nondoped external quantum efficiency 13.7% doped devices. This pioneering provides inspiration for design molecules possessing future, particularly promoting application intense NIR‐OLEDs.

Язык: Английский

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

Advanced Optical Materials, Год журнала: 2024, Номер unknown

Опубликована: Окт. 17, 2024

Abstract Circularly polarized luminescence (CPL) of chiral luminescent materials has gained increasing attention because their significant applications in 3D displays, optoelectronics, anti‐counterfeiting, and encryption. A strongly emissive dye BAcT is synthesized using ( R )‐BINOL as the source a tetraphenylethene group fluorophore. Upon addition to nematic liquid crystal, left‐handed cholesteric structure induced. Different concentrations / S 5011 co‐dopants are added prepare series structurally colored crystal polymer network (CLCN) films. CPL bands detected for these green CLCN films, relatively high | g lum values (up 0.48) obtained. Furthermore, fluorescent PMMA‐BAcT layer prepared by embedding PMMA matrix stacked with construct composite film. Because filtering effect film, value up 1.41 successfully achieved. Colorful patterns prepared, clear pictures observed both reflective modes, contributing optical anti‐counterfeiting enhanced security. This work not only provides deeper understanding CPL, but also establishes practical strategy colorful inkjet printing technology.

Язык: Английский

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Controlling of Circularly Polarized Luminescence via Modulating the Angle Between Transition Electric and Magnetic Dipole Moments

Advanced Functional Materials, Год журнала: 2025, Номер unknown

Опубликована: Янв. 21, 2025

Abstract The most challenging task in the development of chiral luminescent materials is currently increasing dissymmetry factors ( g PL , EL ) circularly polarized luminescence (CPL). Current research primarily focuses on enhancing molecular transition magnetic dipole moment, while angle between electric and moment θ e,m has received comparatively limited attention. In this study, two pairs intrinsically axial fluorescence (CP‐MR‐F) thermally activated delayed (CP‐MR‐TADF) enantiomers R / S ‐BBCz‐BN ‐OBBCz‐BN) with increased by modulating are reported. Based ‐5 H ,5′ ‐6,6′‐bibenzo[ b ]carbazole units, theoretically calculated cal for 17.7° 1.1 × 10 −2 respectively, enabling excellent CPL properties | 5.8 −3 toluene, representing one highest values among MR materials. By employing less conjugated ‐7,7′,8,8′,9,9′,10,10′‐octahydro‐5 groups better electron donating ability, ‐OBBCz‐BN demonstrate good MR‐TADF a peak at 467 nm, full width half‐maximum 27 2.5 . Furthermore, optimized organic light‐emitting diodes based these showcase high maximum external quantum efficiencies 24.7%/33.3% mirror symmetrical electroluminescence 3.4/1.2 respectively.

Язык: Английский

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Chiral Resolution and Chiroptical Properties of Hindered Tetraphenylethylene Helicates

Organic Letters, Год журнала: 2025, Номер unknown

Опубликована: Янв. 28, 2025

Hindered tetraphenylethylene (hTPE) helicates are resolved into two left-handed (M) and right-handed (P) isomers by linkage removal of chiral auxiliary (1R,2S,5R)-menthol, furnishing gram-scale hTPE enantiomers via flash silica column chromatography. helicate bearing electron-accepting cyano electron-donating triphenylamine groups can emit deep-blue CPL signals with a fluorescence quantum yield surpassing 50%. Full-color white-light emission were achieved blending them dyes in poly(methyl methacrylate) (PMMA) film.

Язык: Английский

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Circularly polarized luminescence of polymers with coil to helix transformation in water system triggered via metal coordination

Polymer, Год журнала: 2022, Номер 255, С. 125123 - 125123

Опубликована: Июль 2, 2022

Язык: Английский

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Seeding Control in Chirality Triggering of Red-Emitting Organic Charge-Transfer Cocrystal Helixes from Achiral Molecules

ACS Applied Materials & Interfaces, Год журнала: 2024, Номер 17(1), С. 1953 - 1961

Опубликована: Дек. 20, 2024

Supramolecular chirality has gained immense attention for great potential, in which the rational engineering strategy facilitates unique helical stacking/assembly, high chiroptical behavior, and prime biomedical activity. In this study, we reported a novel chiral organic donor–acceptor cocrystal based on asymmetrical components of benzo(b)naphtho(1,2-d)thiophene (BNT) 9-oxo-9H-indeno(1,2-b)pyrazine-2,3-dicarbonitrile (DCAF) that exhibited red emission using simple solution approach. During self-assembly, kinetically controlled growth polar solvent or substrate induction led to packing morphology twisted by cooperation electrostatic potential energy chirality. Intriguingly, "seeding-control" mechanism was newly developed production c-BNT–DCAF crystals with defined uniform form, enables transfer amplification from microscopic macroscopic level via supramolecular stacking. By introducing additives even small break at edge, first nucleus acted as seeding guide donor/acceptor molecule alignment into same handedness. A remarkably dissymmetry factor (glum) value 0.1 demonstrated manipulated ribbons, is highest among charge-transfer complexes. This work offers us more paths design systems vital applications optoelectronics, micro/nanomechanics, biomimetics.

Язык: Английский

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Electrochemical Synthesis of 1,1′-Binaphthalene-2,2′-Diamines via Transition-Metal-Free Oxidative Homocoupling

Sustainable Chemistry, Год журнала: 2022, Номер 3(4), С. 551 - 557

Опубликована: Дек. 4, 2022

The facile and green synthesis of 1,1′-binaphthalene-2,2′-diamine (BINAM) derivatives was established via the anodic dehydrogenative homo-coupling 2-naphthylamines. sustainable protocol provided a series BINAMs in excellent yields up to 98% with good current efficiency (66%) H2 as sole coproduct without utilizing transition-metal reagents or stoichiometric oxidants.

Язык: Английский

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