Strong Circularly Polarized Electroluminescence Promoted by Using Chiral Co‐Assembled Liquid Crystal Polymers

Advanced Optical Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 10, 2025

Abstract Achieving high circularly polarized electroluminescence (CP‐EL) performance in organic light‐emitting diodes (OLEDs) remains a significant challenge. In this study, chiral nematic liquid crystal polymers (LCPs) are co‐assembled as fluorescent materials by doping 1 wt% binaphthyl‐based R/S ‐D inducers into LCP ( P‐PyP ), displaying blue luminescence (CPL) signals (| g lum | = 0.025, λ em 470 nm, Φ FL 37%) after thermal annealing at 140 °C. Notably, the resulting films can serve emitting layer (EML) non‐doped OLEDs, and exhibit good CP‐EL emissions EL −0.019/+0.015, 484 nm). This work demonstrates pathway for through co‐assembly of LCPs.

Language: Английский

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Circularly Polarized Organic Light‐Emitting Diode Based on Device Functional Layer Materials

Small, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 31, 2025

Circularly polarized light-emitting devices have found extensive application prospects in 3D displays and optoelectronic information. Among them, circularly organic diodes (CP-OLED), as a rising star of devices, achieved good research results. However, the preparation CP-OLED with high electroluminescence asymmetry factor external quantum efficiency is hot difficult topic. At present, approaches for achieving via are: 1) Using chiral materials luminescent materials, 2) Utilizing functional materials. This review summarizes recent methodologies used manufacturing CP-OLED. It focuses on construction strategies applications (chiral host hole transport electron materials) While challenges such complex design material interactions persist, advancements device architecture propel forward. These developments promise to elevate focal point research, facilitating high-performance, luminescence (CPL)-capable practical applications.

Language: 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, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 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.

Language: Английский

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

Molecules, Journal Year: 2025, Volume and Issue: 30(2), P. 390 - 390

Published: Jan. 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.

Language: Английский

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Enhancing Circularly Polarized Luminescence in Chiral Fluorescent Dyes via Cholesteric Liquid Crystal Polymer Networks

ACS Applied Polymer Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 20, 2025

Materials with circularly polarized luminescence have garnered significant attention due to their applications in anticounterfeiting and displays. In this work, we synthesized a pair of AIEgens, designated as D- L-TA-TPE, dopants by utilizing tartaric acid tetraphenylethylene. These AIEgens were incorporated into nematic liquid crystal polymer network films. The resulting films exhibited |glum| values about 7.0 × 10–3, which can be attributed the chiral conformations these two AIEgens. For AIEgen-doped cholesteric (CLCN) films, selective Bragg reflection CLCN reached 0.7. When composite incorporating both fluorescent layers examined, 1.6. value increased increasing film thickness. patterns prepared using photomask or through screen printing. Based on handedness CPL, distinct images observed left- right-handed circular polarizers. Therefore, are potentially applied for decoration anticounterfeiting.

Language: Английский

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Hierarchical Chirality Transfer and Amplification within Conjugated Helical Polymers for Efficient Circularly Polarized Organic Light-Emitting Diodes and Photodetectors

ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: unknown

Published: April 7, 2025

Circularly polarized organic light-emitting diodes (CP-OLEDs) and CP photodetectors have received enormous attention owing to their promising potential in light-related technologies. The simultaneous construction of efficient CP-OLEDs using the multifunctionality same chiral material remains be explored. Herein, achiral conjugated polymer poly(9,9-dioctylfluorene) (PFO) is used for coassembly with helical polyacetylenes. resulting emitters can achieve high-performance circularly electroluminescence (CPEL) a large dissymmetry factor (gEL) 0.11 high brightness 9035 cd m-2. By introducing flexible substrate into device, are realized. Additionally, such serve as photoactive layer photodetector detect light, maximum photocurrent (gph) order 10-1. This work provides route realize factors polyfluorene polymer, facilitating comprehensive versatile development.

Language: Английский

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High‐Performance Solution Processable Single‐Emitting‐Layer White Circularly Polarized Electroluminescence

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 24, 2024

Abstract Achieving efficient circularly polarized white organic light‐emitting diode (CP‐WOLED) remains a significant challenge. In this study, proof‐of‐concept for realizing CP‐WOLED is proposed using an electroplex emission strategy between chiral thermally activated delayed fluorescence (TADF) emitter and hole‐transporting material. A series of polymers ( R / S )‐E‐x (x = 0.02, 0.05, 0.1) are designed prepared via random copolymerization chromophore styrene moiety, which shows typical TADF character. The neat film )‐E‐0.1 presents distinct chiroptical properties with dissymmetry factor (| g lum |) 2.8 × 10 −3 . Notably, solution‐processable, single‐emitting‐layer CP‐WOLEDs fabricated these in combination 1,1‐ bis [(di‐4‐tolylamino)phenyl]cyclohexane (TAPC) as the emitter, achieving record maximum external quantum efficiency 15.1% Commission Internationale de lʹeclairage coordinate (0.36, 0.40). Importantly, exhibit impressive | EL value 2.4 This research provides straightforward effective realization high‐performance CP‐WOLED.

Language: Английский

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Circularly polarized light emission from encapsulated aggregation-induced emission achiral luminogen within the supramolecular helical nanofilament networks

Journal of Colloid and Interface Science, Journal Year: 2024, Volume and Issue: 682, P. 60 - 69

Published: Nov. 26, 2024

Language: Английский

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