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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Spiro-materials with aggregation-induced emission

Matter, Journal Year: 2024, Volume and Issue: 7(10), P. 3390 - 3421

Published: Oct. 1, 2024

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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Qcforever2: Advanced Automation of Quantum Chemistry Computations

Journal of Computational Chemistry, Journal Year: 2025, Volume and Issue: 46(3)

Published: Jan. 25, 2025

ABSTRACT QCforever is a wrapper designed to automatically and simultaneously calculate various physical quantities using quantum chemical (QC) calculation software for blackbox optimization in space. We have updated it QCforever2 search the conformation optimize density functional parameters more accurate reliable evaluation of an input molecule. In optimization, can work as compactly arranged surrogate models costly experiments. future QC calculations would be good companion laboratories, providing exploitation

Language: Английский

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Thermally Invertible Full-Color Circularly Polarized Luminescence with High Dissymmetry Factors and High Quantum Yields in Fluorene Derivatives with Induced Chirality Generated in Chiral Liquid Crystals

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

Published: Feb. 19, 2025

Deliberately targeted emission wavelengths, high quantum yields (QYs), and luminescence dissymmetry factors (glum) are essential for chiral materials exhibiting circularly polarized (CPL). The addition of achiral luminophores to nematic liquid crystals (N*-LCs) is a promising way generate CPLs. We aimed red-green-blue (RGB)- white-colored CPLs by adding each three types fluorene-based luminescent molecules their mixtures N*-LCs. Herein, derivatives with RGB colors were synthesized added N*-LCs containing alkylcyanobiphenyl- alkylcyanoterphenyl-based N-LCs an axially binaphthyl dopant. A mixture the fluorene was subsequently prepared at optimum mixing ratio dissolved in exhibited induced white QY values 60-90% glum 0.5-1.0. value 1.0 highest among reported thus far, there no examples that simultaneously exhibit both glum. Furthermore, temperature-responsive N*-LC thermally invertible compound, resulting reversible thermal inversion CPL.

Language: Английский

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Triarylboron-Based Dual Thermally Activated Delayed Fluorescence Emitter for Single Molecule White Light-Emitting Diodes

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

Published: March 26, 2025

Single-molecule emitters with dual thermally activated delayed fluorescence (TADF) characteristics are very promising for application in organic light-emitting diodes (OLEDs). Rarely reported, dual-TADF materials, especially mechanochromic demand. We present two donor-acceptor emitters, Mes*BA-Ac and FXylBA-Ac, which exhibit the solid state due to separation of HOMO LUMO strong intermolecular interactions. Their phase transition from amorphous crystalline under stimuli leads switchable TADF emissions. By blending poly(methyl methacrylate), we achieve pure white light Commission Internationale de l'Eclairage (CIE) coordinates (0.33, 0.32). Furthermore, single-molecule (SM-WOLEDs) using have been fabricated, reaching a maximum external quantum efficiency (EQEmax) 1.65% CIE (0.30, 0.31). More importantly, emission mechanism enables devices maintain stable white-light across relatively wide voltage range, providing valuable insights advancement SM-WOLEDs.

Language: Английский

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Supramolecular‐Assembly and Surfactant‐Regulated Circularly Polarized Luminescence from a Spiranic BINOL‐Derived Borate Isoindolyl‐Indolenine (BBI) Dye

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

Published: April 4, 2025

Abstract Circularly polarized luminescence (CPL) materials have attracted significant attention owing to their unique luminescent properties and broad range of applications. However, challenges remain, including controlling helical assembly, mitigating aggregation‐caused quenching, balancing quantum yield ( Φ PL ) with g values. Here, the study reports synthesis a novel asymmetric, spiranic O‐organoboranes bearing isoindolyl‐indolenine scaffold (BBI) axial chirality through BINOL substitution, as well its supramolecular assembly surfactant‐regulated tunable CPL behaviors. The newly designed BBI dye shows relative weak 10% in toluene. Supramolecular acetonitrile/water co‐solvents exhibit an obvious aggregation‐induced emission (AIE) process, leading formation spherical nanostructures red‐shifted orange‐yellow (554 nm, = 0.012, 7%). Moreover, surfactant sodium dodecyl sulfonate (SDS) can promote aggregation pure deionized water, producing nanofibers blue‐shifted yellow (536 0.006, 13%). Crystal growth toluene/hexane SDS aqueous/acetonitrile systems reveals chiral crystals P 212121 space group, offering insights into amplification. This demonstrates ability precisely control parameters, X‐ray single‐crystal analysis providing additional understanding regulation.

Language: Английский

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Assembly‐Induced Carbon Dots Fluorescence Enhancement Enables Single‐Component Tunable White Circular Polarization Luminescence

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

Published: April 7, 2025

Abstract White circularly polarized luminescence (WCPL) materials have attracted increasing attention in recent years owing to their numerous applications 3D displays, optoelectronic devices, and sensors. However, the use of single‐component WCPL solid‐state phosphors for display remains challenging. In this study, piperazine its derivatives are used as carriers construct solid luminescent materials. Aspartic acid served a chiral source prepare series carbon dots (Ch‐CDs) with tunable emission from cold warm white. The Ch‐CDs achieved maximum fluorescence quantum yield 34% asymmetry factor 5.1 × 10 −3 . Detailed photodynamic analysis revealed that intrinsic self‐trapped exciton state is primarily responsible spectral broadening Ch‐CDs. addition, formation curved nanoribbons identified key WCPL. Finally, white light film successfully fabricated, demonstrating potential light‐emitting diodes optical

Language: Английский

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Circularly Polarized Electroluminescence from Organic Emitters

Published: Jan. 1, 2025

Language: Английский

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Tunable Near‐White Light Emission From a Single‐Molecule via Strategic Utilization of Aldehyde‐Gemdiol Intrinsic Equilibrium

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

Published: April 24, 2025

Abstract White‐light emitting organic materials have garnered significant attention due to their potential applications in lighting and display technologies. Compared systems that emit distinct colors by combining multiple molecules, single‐molecule white‐light emission offer notable advantages, such as simple preparation, good repeatability stability. In this study, a novel fluorescent molecule (BTP‐CHO) was developed. For the first time, near‐white light system exploiting internal equilibrium of aldehyde‐gemdiol water BTP‐CHO constructed. exists predominantly aldehyde form DMSO shows green fluorescence; while blue fluorescence because water. Polychromatic photoluminescence could be achieved fine‐tuning various parameters, including excitation wavelength solvent ratio. Additionally, we synthesized three derivatives for further investigating universality strategy results indicate has universality. Finally, successfully applied development information encryption hydrogels. This work provides new insights into design emitters broadens scope research on intrinsic about emitting.

Language: Английский

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