Perspective on next-generation hyperfluorescent organic light-emitting diodes

Chemical Science, Journal Year: 2024, Volume and Issue: unknown

Published: Jan. 1, 2024

The evolution of next-generation HF-OLED technology and current challenges.

Language: Английский

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Pressure‐Tailored π–π Stacking in Dimers Enhances Blue Photoluminescence in Boron‐Based Organic Molecules

Laser & Photonics Review, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 11, 2025

Abstract Organic materials with exceptional blue photoluminescence have emerged as a captivating class of materials, exhibiting promising applications full‐color display and solid‐state lighting. However, the quenching is largely unsolved problem towing to strong π – interaction in aggregation effect or electrostatic repulsion. Herein, strategy harvest remarkably enhanced emission phenylboric acid molecules intricate hydrogen bond networks through pressure treatment engineering proposed. Intriguingly, quantum yields pressure‐treated experiences significant enhancement from 2.3 % 31.5 %, which shows bright emission. The inhibition benzene ring vibration reduction stacking originating offset mode are highly responsible for photoluminescence. This work demonstrates feasibility modulating molecular patterns achieve efficient presents momentous improving optical properties organic materials.

Language: Английский

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3D N-heterocyclic covalent organic frameworks for urea photosynthesis from NH3 and CO2

Nature Communications, Journal Year: 2025, Volume and Issue: 16(1)

Published: Jan. 28, 2025

Abstract Artificial photosynthesis of urea from NH 3 and CO 2 seems to remain still essentially unexplored. Herein, three isomorphic three-dimensional covalent organic frameworks with twofold interpenetrated ffc topology are functionalized by benzene, pyrazine, tetrazine active moieties, respectively. A series experiment results disclose the gradually enhanced conductivity, light-harvesting capacity, photogenerated carrier separation efficiency, co-adsorption capacity towards in order benzene-, pyrazine-, tetrazine-containing framework. This turn endows framework superior photocatalytic activity production yield 523 μmol g −1 h , 40 4 times higher than that for benzene- pyrazine-containing framework, respectively, indicating heterocyclic N microenvironment-dependent catalytic performance these photocatalysts. is further confirmed in-situ spectroscopic characterization density functional theory calculations. work lays a way sustainable urea.

Language: Английский

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Iron-catalysed C(sp²)–H activation for aza-annulation with alkynes on extended π-conjugated systems

Nature Synthesis, Journal Year: 2024, Volume and Issue: 3(11), P. 1349 - 1359

Published: July 9, 2024

Language: Английский

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Unveiling the Centrosymmetric Effect in the Design of Narrowband Fluorescent Emitters: From Single to Double Difluoroboron Cores

Journal of the American Chemical Society, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 25, 2024

Narrowband fluorescent emitters are receiving significant attention due to the great potential for creating ultrahigh-definition organic light-emitting diode displays (UHD-OLED). Unveiling innovative mechanisms design new high-performance narrowband is a concerted endeavor in both academic and industrial circles. Theoretical calculations reveal that centrosymmetric dianilido-bipyridine boron difluoride framework (cs-DAPBF2) exhibits significantly reduced structural relaxation compared previously reported asymmetric structures with monofluoroboron cores, opportunities development of emitters. In this work, we present dual chelation-assisted C–H/C–H homocoupling strategy efficiently synthesize 3,3′-amino-2,2′-bipyridine skeleton, enabling straightforward construction series symmetric cs-DAPBF2-based Through molecular optimization, have developed green emitter, cs-DMeAPBF2-MP, which demonstrates narrow full width at half-maximum (fwhm) 20 nm, high photoluminescence quantum yield (ΦPL) 98%, large molar absorptivity (ε) 2.10 × 104 M–1 cm–1, horizontal dipole ratio (Θ//) 77%. These properties make cs-DMeAPBF2-MP promising candidate fabricating high-efficiency, diodes (OLEDs) minimal efficiency roll-off. This study represents first successful application DAPBF2 architecture OLEDs.

Language: Английский

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Harnessing the enol/keto-form emission of ESIPT: mechanochromism, multi-channel imaging, and detection of a chemical warfare agent mimic

Science China Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 2, 2025

Language: Английский

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Ruthenium-catalyzed C–H bond activation and annulation of phenothiazine-3-carbaldehydes: facile access to dual-emission materials

Chemical Science, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

A ruthenium-catalyzed C–H bond activation and annulation reaction efficiently constructed the structurally diverse pyrido[3,4- c ]phenothiazin-3-iums with anti-Kasha dual-emission TADF characteristics.

Language: Английский

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Developing Red and Near-Infrared Delayed Fluorescence Emission in Nitrogen-Substituted Donor–Acceptor Polycyclic Hydrocarbon OLED Emitters: A Theoretical Study

The Journal of Physical Chemistry A, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 26, 2025

Nitrogen substitutions have shown a great impact for the development of thermally activated delayed fluorescence (TADF)-based organic light-emitting diode (OLED) materials. In particular, much focus has been devoted to nitrogen-substituted polycyclic aromatic hydrocarbons (PAHs) TADF emitters. this context, we provide here molecular design approach symmetric nitrogen in fused benzene ring PAHs based on dibenzo[a,c]picene (DBP) molecule. We designed possible donor–acceptor (D–A) compounds with dimethylcarbazole (DMCz) and dimethyldiphenylamine (DMDPA) donors studied structure photophysics D–A compounds. The twisted extended D–A-type PAH emitters demonstrate red near-infrared (NIR) emission. lead significant LUMO stabilization reduced HOMO–LUMO energy gaps as well. Additionally, computed significantly smaller singlet–triplet splittings (ΔEST) comparison non-nitrogen-substituted investigated ortho-linked show relatively large twisting separation small ΔEST compared their para-linked counterparts. For higher number (4N)-substituted emitters, predict adiabatic (ΔESTadia) range 0.01–0.13 eV, tert-butylated donors, even obtained ΔESTadia values 0.007 eV. Computed spin–orbit coupling (SOC) T1 triplet state order 0.12–2.28 cm–1 suggests repopulation singlet charge transfer (1CT) excitons from CT locally excited (3CT+LE) states. Importantly, SOC induce reverse intersystem crossing (RISC) rate high 1 × 106 s–1, which will cause NIR 4N-substituted Notably, emission compound B4 at 670 nm D4 713 987 1217 D3 E3, respectively.

Language: Английский

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Synthesis of Polycyclic Heteroarenes via Rh(III)-Catalyzed Twofold C-H Activation of 3-Aryl-2H-benzo[b][1,4]oxazines and Annulation with α-Diazo-β-ketoesters

The Journal of Organic Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: March 14, 2025

An efficient Rh(III)-catalyzed annulation between 3-aryl-2H-benzo[b][1,4]oxazines and α-diazo-β-ketoesters was developed, affording a series of polycyclic heteroarenes in moderate to excellent yields with good functional group compatibility. The procedure featured high efficiency, redox neutrality, twofold ortho-C-H activation, dual [4 + 2] annulation. Moreover, several important intermediates products have been isolated as powerful evidence for the proposed reaction mechanism.

Language: Английский

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Aromaticity Localization Effects in Polycyclic Aromatic Hydrocarbons for Discovering Narrowband Fluorescence Materials

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

Published: May 22, 2025

Achieving narrowband fluorescence in polycyclic aromatic hydrocarbons (PAHs) is crucial for ultrahigh-definition organic light-emitting diodes (UD-OLEDs), yet the underlying structure-property relationships that dictate emission bandwidth remain insufficiently understood. In this study, we introduce aromaticity localization as a predictive framework identifying emitters. Using nucleus-independent chemical shift (NICS) analysis, uncover strong correlation between localized and reduced vibrational coupling, demonstrating restricting π-electron delocalization effectively suppresses shoulder peaks, thereby minimizing spectral broadening. To validate concept, designed new class of imine-amine-type PAHs (IA-PAHs) integrates electron-deficient imine electron-rich amine units, generating multiple-resonance-type electronic structure. Building on steric-hindrance-guided C-H activation strategy, precisely controlled regioselectivity pyridine fusion within triphenylamine framework, leading to discovery red-emitting II-b green-emitting III-c featuring aromaticity. Notably, exhibited an exceptionally red at 660 nm with full width half-maximum only 35 (0.10 eV). OLEDs incorporating demonstrated high efficiency minimal roll-off fully met stringent BT.2020 standard, Commission Internationale de l'Eclairage (CIE) coordinates [0.71, 0.29]. This work not establishes empirical intuitive design principle fluorophores but also represents significant advancement deep-red OLED technology, setting benchmark conventional fluorescent

Language: Английский

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