Recent advances in circularly polarized luminescence of planar chiral organic compounds

Chemical Communications, Journal Year: 2024, Volume and Issue: 60(53), P. 6728 - 6740

Published: Jan. 1, 2024

This review overviews recent research on circularly polarized luminescence from planar chiral organic compounds, focusing their synthetic strategies, properties and applications.

Language: Английский

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Multiple-resonance thermally activated delayed fluorescence materials based on phosphorus central chirality for efficient circularly polarized electroluminescence

Materials Horizons, Journal Year: 2024, Volume and Issue: 11(19), P. 4722 - 4729

Published: Jan. 1, 2024

Circularly polarized organic light-emitting diodes (CP-OLEDs) hold great potential for naked-eye 3D displays, necessitating efficient chiral luminescent materials with an optimal CP luminescence (CPL) dissymmetry factor (

Language: Английский

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Efficient solution-processable OLEDs near BT.2020 red standard enabled by a multiresonant emitter

Science Bulletin, Journal Year: 2024, Volume and Issue: 69(19), P. 2983 - 2986

Published: Aug. 3, 2024

Language: Английский

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Efficient circularly polarized multiple resonance thermally activated delayed fluorescence from B,N-embedded hetero[8]helicene enantiomers

Chemical Science, Journal Year: 2024, Volume and Issue: 15(37), P. 15170 - 15177

Published: Jan. 1, 2024

A pair of CP-MR-TADF enantiomers with high-order B,N-embedded hetero[8]helicene, ( P / M )-BN-TP-ICz, was constructed. CP-OLEDs exhibit narrow green emission peaking at 540 nm maximum EQEs 32.0% and g EL s approximately 7.70 × 10 −4 .

Language: Английский

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Ultra-Narrowband Circularly Polarized Luminescence from Multiple 1,4-Azaborine-Embedded Helical Nanographenes

Journal of the American Chemical Society, Journal Year: 2024, Volume and Issue: 146(43), P. 29782 - 29791

Published: Oct. 22, 2024

In this manuscript we present a strategy to achieve ultranarrowband circularly polarized luminescence (CPL) from multiple 1,4-azaborine-embedded helical nanographenes. The impact of number and position boron nitrogen atoms in the rigid core molecule on optical properties─including absorption emission maxima, photoluminescence quantum yield, Stokes shift, excited singlet–triplet energy gap full width at half-maximum (fwhm) for CPL fluorescence─was investigated. molecules reported here exhibits fluorescence (fwhm 16–17.5 nm toluene) 18–19 toluene). To best our knowledge, is among narrowest any organic date. Quantum chemical calculations, including computed spectra involving vibronic contributions, provide valuable insights future molecular design aimed achieving narrowband CPL.

Language: Английский

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Axially Chiral Multiple Resonance Thermally Activated Delayed Fluorescence Enantiomers for Efficient Circularly Polarized Electroluminescence

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

Published: June 24, 2024

Abstract The chiral materials and circularly polarized organic light‐emitting diodes (CP‐OLEDs) have potential applications in 3D display due to the generation of luminescence (CPL). However, achieving a combination chirality, high efficiency, narrowband emission for thermally activated delayed fluorescence (TADF) has proven be challenging endeavor, often involving complicated synthesis separation processes. In this study, simple design approach is introduced by direct connection multiple resonance (MR) skeleton ( R/S )‐1,1′‐binaphthyl units, obtaining two pairs MR‐TADF enantiomers )‐DtCzB‐OBN )‐DtCzB‐BN without resolution. These exhibit blue‐green emissions with photoluminescence quantum efficiencies up 98% doped films full‐width at half‐maximum 22 nm both toluene device. Furthermore, symmetric CPL spectra dissymmetry factors g PL ) + 3.86( ± 0.317) × 10 −4 /‐3.37( 7.09( 0.233) /‐7.74(± , respectively. CP‐OLEDs based on impressive maximum external 30.0% 33.9%, as well EL +3.40( 0.362) /‐3.11( 7.99( 0.391) /‐8.19( This research proposes strategy directly constructing high‐performance CP‐OLEDs, avoiding separation.

Language: Английский

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A Deep‐Red Emissive Sulfur‐Doped Double [7]Helicene Photosensitizer: Synthesis, Structure and Chiral Optical Properties

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(45)

Published: Aug. 8, 2024

Doping of polycyclic conjugated hydrocarbons (PCHs) with sulfur atoms is becoming more and important as a means creating unique functional materials. Recently, thiophene-containing multiple helicenes have garnered enormous attention due to their intriguing electronic (chir)optical properties compared carbohelicenes. However, the efficient synthesis thiopyran-containing underlying doping mechanisms are rather unexplored. Herein, structural analysis double [7]helicene 3 reported. X-ray crystallographic reveals its dication C

Language: Английский

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Multifunctional Amino‐Boranes Isomer Room‐Temperature Phosphorescent Material: Multi‐Substrate Multicolor Luminescence, Multi‐Level Anti‐Counterfeiting, Light‐Controlled Data Erasing/Writing, Data Logic Operation, and High Anti‐Laundry Detergent Performance

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

Published: Sept. 9, 2024

Abstract Significant advances are made in understanding the structure‐property relationship room‐temperature phosphorescence (RTP) materials. For example, intramolecular charge transfer (ICT) structural molecules based on electron donors(D) and acceptors(A) an efficient method to achieve RTP. However, ability precisely regulate singlet‐triplet energy gap (Δ E ST ) through molecular design control RTP emissions remains constrained. Herein, a group of 4BN‐NP 5BN‐NP isomers is reported with D A position isomerization, where exhibits photo‐induced orange afterglow phenomenon PMMA. Calculations show that spin‐orbit coupling (SOC) value greater compared intersystem crossing (ISC) channel more efficient, resulting smaller Δ for . This indicates short ICT conducive inducing emission. In addition, compound co‐doped red fluorescent dyes (RhB, Rh6G, RBNN) PMMA produces resonance (PRET), Surprisingly, light‐activated yellow can be obtained by attaching polymethyl methacrylate (PMMA) nylon filaments, its intensity does not diminish even when it immersed water containing detergent solution, thus expanding prospects application textile encryption.

Language: Английский

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Helically chiral multiresonant thermally activated delayed fluorescent emitters and their use in hyperfluorescent organic light-emitting diodes

Chemical Science, Journal Year: 2024, Volume and Issue: 15(41), P. 16917 - 16927

Published: Jan. 1, 2024

Helically chiral MR-TADF compounds tBuPh-BN and DPA-tBuPh-BN show narrowband circularly polarized luminescence that translates into high-performance hyperfluorescent organic light-emitting diodes.

Language: Английский

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Tethered Helical Ladder-Type Aromatic Lactams

Journal of the American Chemical Society, Journal Year: 2024, Volume and Issue: 146(17), P. 11978 - 11990

Published: April 16, 2024

Tethered nonplanar aromatics (TNAs) make up an important class of aromatic compounds showing unique features. However, the knowledge on synthesis, structures, and properties TNAs remains insufficient. In this work, a new type TNAs, tethered lactams, is synthesized via Pd-catalyzed consecutive intramolecular direct arylations. These molecules possess helical ladder-type conjugated system to 13 fused rings. The overall yields ranged from 3.4 4.3%. largest 6L-Bu-C14, demonstrates guest-adaptive hosting capability for first time. When binding fullerene guests, cavity 6L-Bu-C14 became more circular better accommodate spherical molecules. host–guest interaction thoroughly studied by X-ray crystallography, theoretical calculations, fluorescence titration, nuclear magnetic resonance (NMR) titration experiments. shows stronger with C70 than C60 due convex–concave π–π interaction. P M enantiomers all lactams show distinct persistent chiroptical demonstrate potential chiral as circularly polarized luminescence (CPL) emitters.

Language: Английский

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