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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General Strategy to Prepare Nondoped Circularly Polarized Luminescent Liquid Crystal Materials with Tunable Performance

ACS Applied Materials & Interfaces, Год журнала: 2024, Номер 16(7), С. 9323 - 9332

Опубликована: Фев. 9, 2024

Chiral luminescent liquid crystals have attracted widespread attention from researchers due to their unique advantages in constructing circularly polarized (CPL) materials with large asymmetry factor (glum) values. However, how effectively prepare nondoped CPL chiral remains a challenge. In this article, we developed an effective and universal method crystal materials. To achieve our strategy, copolymerized monomer M0Mt α-cyanostilbene-based monomers MmPVPCN (m = 6, 8, 10) bearing different flexible spacer lengths obtain series of copolymers poly(MmPVPCN(x)-co-M0Mt(y)). Under the induction component, α-cyanostilbene component assembles form crystals. Meanwhile, also exhibits aggregation-induced emission enhancement characteristics. Therefore, help selective reflection effect crystals, copolymer films can emit efficient CPL. For poly(M8PVPCN(0.85)-co-M0Mt(0.15)), glum solid luminescence quantum yield −2.61 × 10–2 25.04%, respectively. addition, by altering chemical structure copolymers, phase be controlled, thereby regulating properties.

Язык: Английский

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Three‐Level Chirality Transfer and Amplification in Liquid Crystal Supramolecular Assembly for Achieving Full‐Color and White Circularly Polarized Luminescence

Advanced Materials, Год журнала: 2024, Номер unknown

Опубликована: Ноя. 2, 2024

Chiral liquid crystal supramolecular assembly provides an ideal strategy for constructing excellent circularly polarized luminescence (CPL) materials. However, the chirality transfer in chiral crystals normally occurs at two levels from configurational to phase chirality. The more precise and of transmission are fascinating but remain challenging. present work reports first success three-level amplification configurationally point small molecules conformationally helical polymers finally cholesteric composed nonfluorescent (P46) nematic crystals. Noticeably, twisting power P46 is five-fold larger than its monomer. Full-color white CPL with maximum dissymmetry factor up 1.54 photoluminescence quantum yield 63.8% realized utilizing combined selective reflection mechanism. Also significantly, electrically stimuli-responsive switching device as well anti-counterfeiting security, information encryption, logic gate applications developed. This study deepens understanding across different hierarchical levels.

Язык: Английский

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Ultrastrong Circularly Polarized Luminescence Triggered by the Synergistic Effect of Chiral Coassembly and Selective Reflective Cholesteric Liquid Crystal Film

ACS Materials Letters, Год журнала: 2024, Номер 6(7), С. 2957 - 2963

Опубликована: Июнь 12, 2024

Enhancing the dissymmetry factor (glum) is crucial for circularly polarized luminescence (CPL) applications. Herein, we present an innovative strategy achieving ultrastrong |glum| of 1.73. This accomplished through synergistic effect coassembly CPL-emitting ternary liquid crystal (T-N*-LC, = 0.47) and selective reflection (λ 590 nm) polymer cholesteric (CLC) within a composite system. Unlike mismatched chirality combination (|glum| 1.42, ΔFL 57%), matched demonstrates CPL signal with 1.73 low 50% when direction T-N*-LC agrees CLC film's chirality. Furthermore, alter matching degree system by applying direct-current (DC) electric field to realize switch. study paves way developing outstanding CPL-active display materials amplification glum.

Язык: Английский

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Strong Circularly Polarized Phosphorescence of Achiral Pt(II) Metallomesogen Induced by Using a Chiral Co‐Assembly Strategy

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

Опубликована: Фев. 21, 2024

Abstract The high planarity and heavy‐atom effect of Pt(II) metallomesogens promote their stacking in the aggregated state highly efficient phosphorescence. This makes them promising candidate materials for circularly polarized phosphorescence (CPP) triggered by using a chiral co‐assembly strategy. In this paper, nematic phase, achiral robot‐like metallomesogen ( TFPt ) is synthesized, which combines two anchored binaphthyl inducers R/S 1 or 2 to construct cholesteric liquid crystal (N*‐LC) co‐assemblies R / S 1) n ‐(TFPt) 1‐n 2) via intermolecular interactions. resultant N*‐LC 0.03 0.97 exhibit strongest CPP emission with dissymmetry factors g em up 0.18 0.27, respectively, stemming from formation regular helical nanofibers on spin‐coated films process after thermal annealing at 165 °C.

Язык: Английский

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Enhanced circularly polarized luminescence emission promoted by achiral dichroic oligomers of F8BT in cholesteric liquid crystal

Chinese Chemical Letters, Год журнала: 2024, Номер 35(11), С. 109864 - 109864

Опубликована: Апрель 8, 2024

Язык: Английский

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Synthesis and Properties of Room-Temperature Phosphorescent Liquid Crystal Copolymers with Linearly Polarized Luminescence Characteristic

ACS Applied Materials & Interfaces, Год журнала: 2023, Номер 15(42), С. 49701 - 49711

Опубликована: Окт. 17, 2023

Room-temperature phosphorescent (RTP) liquid crystal materials have garnered considerable attention because of their significant applications in organic light emitting diodes, polarized materials, and so forth. How to efficiently synthesize pure RTP crystals regulate performance is great significance. In this article, we propose a simple feasible method manipulate properties through copolymerization. We constructed copolymers by copolymerizing monomer bearing biphenyl mesogen with dibenzofuran chromophore. All the synthesized show property introduction mesogen. Meanwhile, changing composition copolymers, it possible performance, including luminescence color lifetime. As content PMDFM0C component increases, phosphorescence lifetime gradually increases. For poly(MDFM0C(0.46)-co-MBi18C(0.54)), can reach 463.0 ms. Moreover, changes copolymer composition, which induce variable room-temperature phosphorescence. addition, when oriented, films emit linearly fluorescence The dichroic ratio polarization values oriented poly(MDFM0C(0.46)-co-MBi18C(0.54)) film are 3.33 0.50, respectively.

Язык: Английский

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Controllable Circularly Polarized Luminescence with High Dissymmetry Factor via Co‐Assembly of Achiral Dyes in Liquid Crystal Polymer Films

Small Methods, Год журнала: 2024, Номер 8(9)

Опубликована: Янв. 14, 2024

Abstract Circularly polarized luminescence (CPL) materials are highly demanded due to their great potential in optoelectronic and chiroptical elements. However, the preparation of CPL films with high dissymmetry factors (g lum ) remains a formidable task, which impedes practical application film‐based devices. Herein, facile strategy prepare solid film g through exogenous chiral induction amplification liquid crystal polymers is proposed. Amplification reversion appear when annealed at nematic crystalline temperature maximal up 0.30 enhancement selective reflection. Thermal annealing treatment different states facilitates formation phase adjusts circularly emission. This work not only provides straightforward versatile platform construct organic capable exhibiting strong emission but also helpful understanding exact mechanism for performance.

Язык: Английский

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Novel AIE liquid crystals with high CPL-active bearing multiple dodecyl/cholesterol-decorated R-BINOL-cyanostilbene

Journal of Molecular Structure, Год журнала: 2024, Номер 1320, С. 139726 - 139726

Опубликована: Авг. 22, 2024

Язык: Английский

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[(2-Dimesitylboryl)phenyl]ethynyl-Substituted [2.2]Paracyclophane Exhibiting Circularly Polarized Luminescence in Both Solution and Solid-State

Molecules, Год журнала: 2025, Номер 30(2), С. 390 - 390

Опубликована: Янв. 18, 2025

Developing a new type of circularly polarized luminescent active small organic molecule that combines high fluorescence quantum yield and luminescence dissymmetric factor in both solution solid state is highly challenging but promising. In this context, we designed synthesized unique triarylborane-based [2.2]paracyclophane derivative, m-BPhANPh2-Cp, which an electron-accepting [(2-dimesitylboryl)phenyl]ethynyl group electron-donating N,N-diphenylamino are introduced into two different benzene rings [2.2]paracyclophane. Owing to the electronic effect these substituents, compound can display charge-transfer emission with large Stokes shifts (∆υ = 4.23 − 8.20 × 103 cm−1) fair yields (ΦF 0.15 0.37) solutions. addition, emit strong blue even much higher than up 0.64 powder spin-coated film). Moreover, enantiomeric forms m-BPhANPh2-Cp show CPL signals dilute |glum|s 9.6 10−3 5.4 10−3, respectively. Thus, it possible achieve tunable from yellow BCPLs ranging 56.7 26.6 M−1 cm−1 intense combing ΦF |glum| state.

Язык: Английский

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