Deep‐Blue Narrowband Hetero[6]helicenes Showing Circularly Polarized Thermally Activated Delayed Fluorescence Toward High‐Performance OLEDs

Advanced Materials, Journal Year: 2023, Volume and Issue: 36(1)

Published: Nov. 14, 2023

Abstract Helicenes exhibit substantial potential as circularly polarized luminescence (CPL) active molecules. However, their application in organic light‐emitting diodes (CP‐OLEDs) is typically hindered by the challenge of integrating both high color purity and efficient triplet‐harvesting capability, particularly blue spectral region. Herein, a series hetero[6]helicene‐based emitters that strategically engineered through helical extension deep‐blue double‐boron‐based multiple resonance thermally activated delayed fluorescence (MR‐TADF) motif, introduced. Importantly, does not cause apparent structural deformation or perturb frontier molecular orbitals; thus, preserving emission MR‐TADF characteristics parent molecule. This approach also leads to reduced reorganization energy, resulting with narrower linewidth higher photoluminescence quantum yield. Further, motif enhances racemization barrier improved CPL performance dissymmetry factor values up 1.5 × 10 −3 . Exploiting these merits, devices incorporating chiral dopants demonstrate within Broadcast Service Television 2020 color‐gamut range, record external efficiencies (EQEs) 29.3%, have distinctive electroluminescence (CPEL) signals. Overall, authors’ findings underscore promising strategy for designing narrowband chiroptical materials advancing high‐definition displays.

Language: Английский

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Chiral-structured heterointerfaces enable durable perovskite solar cells

Science, Journal Year: 2024, Volume and Issue: 384(6698), P. 878 - 884

Published: May 23, 2024

Mechanical failure and chemical degradation of device heterointerfaces can strongly influence the long-term stability perovskite solar cells (PSCs) under thermal cycling damp heat conditions. We report chirality-mediated interfaces based on

Language: Английский

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Fundamentals, Advances, and Artifacts in Circularly Polarized Luminescence (CPL) Spectroscopy

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(44)

Published: Sept. 1, 2023

Objects are chiral when they cannot be superimposed with their mirror image. Materials can emit light an excess of right- or left-handed circular polarization. This circularly polarized luminescence (CPL) is key to promising future applications, such as highly efficient displays, holography, sensing, enantiospecific discrimination, synthesis drugs, quantum computing, and cryptography. Here, a practical guide CPL spectroscopy provided. First, the fundamentals technique laid out detailed account recent experimental advances achieve sensitive accurate measurements given, including all corrections required obtain reliable results. Then most common artifacts pitfalls discussed, especially for study thin films, example, based on molecules, polymers, halide perovskites, opposed dilute solutions emitters. To facilitate adoption by others, custom operating software made publicly available, equipping reader tools needed successful determination.

Language: Английский

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High-Efficiency Circularly Polarized Light-Emitting Diodes Based on Chiral Metal Nanoclusters

Journal of the American Chemical Society, Journal Year: 2024, Volume and Issue: 146(6), P. 4144 - 4152

Published: Feb. 5, 2024

Circularly polarized light-emitting diodes (CP-LEDs) are critical for next-generation optical technologies, ranging from holography to quantum information processing. Currently deployed chiral luminescent materials, with their intricate synthesis and processing limited efficiency, the main bottleneck CP-LEDs. Chiral metal nanoclusters (MNCs) potential CP-LED given ease of processability as well diverse structures excited states. However, films usually plagued by inferior electronic quality aggregation-caused photoluminescence quenching, necessitating incorporation into host materials; without such a scheme, MNC-based LEDs exhibit external efficiencies (EQEs) < 10%. Herein, we achieve an efficiency leap both CP-LEDs cluster-based using novel MNCs aggregation-induced emission enhancement. enantiopure MNC attain EQEs up 23.5%. Furthermore, incorporating devices yield record 36.5% LEDs, along electroluminescence dissymmetry factors (|gEL|) around 1.0 × 10–3. These findings open new avenue advancing light sources optoelectronics.

Language: Английский

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Spintronic Phenomena and Applications in Hybrid Organic–Inorganic Perovskites

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(27)

Published: March 1, 2024

Abstract The spin degree of freedom in hybrid organic–inorganic perovskites (HOIPs) has become a rapidly growing research topic both HOIPs and spintronics fields due to its fundamental scientific significance tight relevance with optoelectronics. flourishing achievements HOIP call for timely review summarize the key progress guide future developments. In this review, classical spintronic phenomena based on spin‐orbit coupling (SOC) are discussed, especially Rashba splitting related applications such as spin‐charge conversion. Owing unique chirality‐spin coupling, chiral particularly focused on, including chirality‐induced selectivity (CISS). Based complex band structure carrier/exciton, dynamics is also widely investigated constitutes an indispensable part spintronics. Aside from three main threads, other magneto‐optical device exploration involved promising opportunities. Despite continuous breakthroughs spintronics, more efforts required expand material systems, explore new physics, optimize configurations enhanced performance high integration. A deep understanding behaviors will create platform beyond conventional optoelectronic photovoltaic applications.

Language: Английский

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Circularly Polarized Luminescence Induced by Hydrogen‐Bonding Networks in a One‐Dimensional Hybrid Manganese(II) Chloride

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(24)

Published: April 12, 2024

Chiral hybrid metal halides hold great potential as circularly polarized luminescence light sources. Herein, we have obtained two enantiomeric pairs of one-dimensional chiral manganese(II) chloride single crystals, R/S-(3-methyl piperidine)MnCl

Language: Английский

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High Mobility Emissive Organic Semiconductors for Optoelectronic Devices

Journal of the American Chemical Society, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 10, 2025

High mobility emissive organic semiconductors (HMEOSCs) are a kind of unique semiconducting material that simultaneously integrates high charge carrier and strong emission features, which not only crucial for overcoming the performance bottlenecks current optoelectronic devices but also important constructing high-density integrated devices/circuits potential smart display technologies electrically pumped lasers. However, development HMEOSCs is facing great challenges due to mutually exclusive requirements molecular structures packing modes between solid-state emission. Encouragingly, considerable advances on have been made with continuous efforts, successful integration these two properties within individual currently presents promising research direction in electronics. Representative progress, including design HMEOSCs, exploration their applications photoelectric conversion electroluminescent devices, especially photovoltaic cells, light-emitting diodes, transistors, summarized timely manner. The developing other related lasers, spin transistors discussed. We hope this perspective will boost rapid new mechanism understanding wide different fields entering stage.

Language: Английский

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Sensitive near-infrared circularly polarized light detection via non-fullerene acceptor blends

Nature Photonics, Journal Year: 2023, Volume and Issue: 17(8), P. 649 - 655

Published: June 8, 2023

Abstract Circularly polarized light (CPL) is widely used for various applications in sensing and imaging 1–3 . An ongoing challenge to realize high-quality CPL detection using chiral organic semiconductors, especially the near-infrared (NIR) region 4 Chiral molecules tend rely on twisted stereogenic moieties; however, conventional approaches reduce bandgap of semiconductors are based use co-planar backbones that commonly lead molecular symmetries preventing chirality. Here we report a applicable strategy directly induce chiroptical activity planar non-fullerene acceptors 5–7 , which high-performance photovoltaics provide wealth opportunities fill spectral gap NIR regime. We demonstrate proof-of-concept circularly photodiodes chiroptically active acceptor blends, exhibit strong circular dichroism hence great sensitivity region. Importantly, this found be effective wide series state-of-the-art families including ITIC 5 o -IDTBR 6 Y6 analogues 7 substantially broadens range materials detection.

Language: Английский

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π-Extended Helical Multilayer Nanographenes with Layer-Dependent Chiroptical Properties

Journal of the American Chemical Society, Journal Year: 2023, Volume and Issue: 145(49), P. 26824 - 26832

Published: Dec. 4, 2023

Helical nanographenes (NGs) have attracted increasing attention recently because of their intrinsic chirality and exotic chiroptical properties. However, the efficient synthesis extended helical NGs featuring a multilayer topology is still underdeveloped, layer-dependent properties remain elusive. In this study, we demonstrate modular synthetic strategy to construct series novel (1-3) with through consecutive Diels-Alder reaction regioselective cyclodehydrogenation from readily accessible phenanthrene-based precursors bearing ethynyl groups. The resultant exhibit bilayer, trilayer, tetralayer structures elongated π extension rigid backbones, as unambiguously confirmed by single-crystal X-ray or electron diffraction analysis. We find that photophysical these are notably influenced degree extension, which varies number layers, leading obvious redshifted absorption, fast rising molar extinction coefficient (ε), markedly boosted fluorescence quantum yield (Φf). Moreover, embedded [7]helicene subunits in result stable chirality, enabling both chiral resolution exploration Profiting good alignment electric magnetic dipole moments determined structure, excellent circular dichroism circularly polarized luminescence response unprecedented high CPL brightness up 168 M-1 cm-1, rendering them promising candidates for emitters.

Language: Английский

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Carborane-Cluster-Wrapped Copper Cluster with Cyclodextrin-like Cavities for Chiral Recognition

Journal of the American Chemical Society, Journal Year: 2024, Volume and Issue: 146(24), P. 16729 - 16736

Published: June 5, 2024

Chiral atomically precise metal clusters, known for their remarkable chiroptical properties, hold great potential applications in chirality recognition. However, advancements this field have been constrained by the limited exploration of host–guest chemistry, involving clusters. This study reports synthesis a chiral Cu16(C2B10H10S2)8 (denoted as Cu16@CB8, where C2B10H12S2H2 = 9,12-(HS)2-1,2-closo-carborane) cluster an achiral carboranylthiolate ligand. The R-/S-Cu16@CB8 features cavities reminiscent cyclodextrins, which are surrounded carborane yet they crystallize racemate. These cyclodextrin-like demonstrated specific recognition amino acids, indicated responsive output circular dichroism and circularly polarized luminescence signals Cu16 moieties Cu16@CB8 cluster. Notably, quantitative analysis acids short time concomitant deracemization were achieved. Density functional tight-binding molecular dynamics simulation noncovalent interaction further unraveled importance binding sites Dipeptide, tripeptide, polypeptide containing corresponding (Cys, Arg, or His residues) display same recognition, showing generality approach. synergy dual comprising is first cluster, resulting valuable quantification enantiomeric excess (ee) value acids. work opens new avenue sensors based on clusters with unique properties inspires development chemistry.

Language: Английский

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