Chiral Induced Spin Selectivity

Chemical Reviews, Journal Year: 2024, Volume and Issue: 124(4), P. 1950 - 1991

Published: Feb. 16, 2024

Since the initial landmark study on chiral induced spin selectivity (CISS) effect in 1999, considerable experimental and theoretical efforts have been made to understand physical underpinnings mechanistic features of this interesting phenomenon. As first formulated, CISS refers innate ability materials act as filters for electron transport; however, more recent experiments demonstrate that displacement currents arising from charge polarization molecules lead without need net flow. With its identification a fundamental connection between symmetry materials, promises profound ubiquitous implications existing technologies new approaches answering age old questions, such homochiral nature life. This review begins with discussion different methods measuring then provides comprehensive overview known exhibit CISS-based phenomena before proceeding identify structure-property relations delineate leading models effect. Next, it identifies some physics, chemistry, biology. The ends critical assessment field comments future outlook.

Language: Английский

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Materials for chiral light control

Nature Reviews Materials, Journal Year: 2023, Volume and Issue: 8(6), P. 365 - 371

Published: March 13, 2023

Language: Английский

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Chiral materials and mechanisms for circularly polarized light-emitting diodes

Nature Photonics, Journal Year: 2024, Volume and Issue: 18(7), P. 658 - 668

Published: March 25, 2024

Language: Английский

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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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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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Optical Phenomena in Molecule-Based Magnetic Materials

Chemical Reviews, Journal Year: 2024, Volume and Issue: 124(9), P. 5930 - 6050

Published: April 30, 2024

Since the last century, we have witnessed development of molecular magnetism which deals with magnetic materials based on species, i.e., organic radicals and metal complexes. Among them, broadest attention was devoted to molecule-based ferro-/ferrimagnets, spin transition materials, including those exploring electron transfer, nanomagnets, such as single-molecule magnets (SMMs), qubits, stimuli-responsive materials. Their physical properties open application horizons in sensors, data storage, spintronics, quantum computation. It found that various optical phenomena, thermochromism, photoswitching characteristics, luminescence, nonlinear chiroptical effects, well responsivity external stimuli, can be implemented into Moreover, fruitful interactions these effects provide new cross-effects multifunctionality, enriching applications optical, electronic, devices. This Review aims show scope phenomena generated recent advances areas high-temperature photomagnetism, thermometry utilizing SMMs, addressability magneto-chiral dichroism, opto-magneto-electric multifunctionality. These findings are discussed context types accessible for classes

Language: Английский

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Enabling robust blue circularly polarized organic afterglow through self-confining isolated chiral chromophore

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: April 9, 2024

Abstract Creating circularly polarized organic afterglow system with elevated triplet energy levels, suppressed non-radiative transitions, and effective chirality, which are three critical prerequisites for achieving blue afterglow, has posed a formidable challenge. Herein, straightforward approach is unveiled to attain materials by covalently self-confining isolated chiral chromophore within polymer matrix. The formation of robust hydrogen bonds the matrix confers distinctly stabilized molecular state chromophores, endowing emission band at 414 nm, lifetime 3.0 s, luminescent dissymmetry factor ~ 10 −2 . Utilizing synergistic chirality transfer, full-color systems endowed doping colorful fluorescent molecules into designed polymers, empowering versatile applications. This work paves way streamlined design materials, expanding horizons various domains.

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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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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High Comprehensive Circularly Polarized Electroluminescence Performance Improved by Chiral Coassembled Host Materials

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(44)

Published: Aug. 29, 2023

Abstract Circularly polarized organic light‐emitting diodes are of great significance in 3D displays. However, achieving circularly electroluminescence (CP‐EL) simultaneously with a large dissymmetry factor ( g EL ) and high efficiency still remains formidable challenge. Herein, facile efficient strategy is developed for improving the performance CP‐EL devices using device emitting layers chiral coassembled helix nanofiber host materials. Chiral materials (( S ‐/ R ‐2Cz) 0.2 ‐(PFpy) 0.8 could be smartly constructed through intermolecular π–π stacking interactions between achiral conjugated pyridine‐based polymer acceptor (PFpy) binaphthyl‐based donor ‐2Cz). Significantly, resulting hosts greatly promote commercially available phosphorescence emitter to achieve solution‐processed red performances at 620 nm external quantum 4.1% | value 0.014.

Language: Английский

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