Organoboron-based multiple-resonance emitters: synthesis, structure–property correlations, and prospects

Chemical Society Reviews, Journal Year: 2024, Volume and Issue: 53(3), P. 1624 - 1692

Published: Jan. 1, 2024

This review highlights organoboron-based multiple-resonance compounds’ synthetic strategies classified as one-pot borylation, one-shot and late-stage functionalisation, explores material structure–photophysical property correlations.

Language: Английский

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Recent Advances in Narrow Emission Bandwidth Materials for Application in Organic Light‐Emitting Diodes

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

Published: Feb. 21, 2025

Abstract The preparation of narrow emission bandwidth materials is crucial for the development advanced organic light‐emitting diodes (OLEDs). In this review article, state‐of‐the‐art methodologies used emitters with high color purity are summarized, and favorable design strategies rationally organized. Currently OLEDs have some issues, such as device stabilization that must be resolved, should also considered. Given recent exponential growth in number types narrowband emissive organometallic complexes exhibiting multiple‐resonance thermally activated delayed fluorescence metal‐to‐ligand charge transfer characteristics, there an urgent need to establish key technology descriptors purity. review, developments boron, fused indolocarbazole, carbonyl, phosphine oxide, exhibit spectra described, future directions advance performance devices suggested.

Language: Английский

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High‐Efficiency Ultraviolet Electroluminescence from Multi‐Resonance Phosphine Oxide Polycyclic Aromatics

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 63(5)

Published: Dec. 7, 2023

Abstract Efficient ultraviolet (UV) electroluminescent materials remain a great challenge, since short peak wavelength <400 nm and narrow full width at half maximum (FWHM) <50 are simultaneously required. In this sense, multi‐resonance (MR) thermally activated delayed fluorescence (TADF) emitters featuring narrow‐band emissions hold the promise for UV applications. Herein, novel MR‐TADF skeleton carbazole‐phosphine oxide (P=O) fused aromatics is developed to construct first two MR named CzP2PO tBCzP2PO . addition synergistic resonance effects of P=O N atom, sp 3 ‐hybrid P atom renders curved polycyclic planes , giving rise their narrowband with wavelengths <390 FWHM<35 nm. Besides configuration quasi‐planarization radiation enhancement quenching suppression, moiety further enhances singlet‐triplet coupling facilitate reverse intersystem crossing, resulting in state‐of‐the‐art photoluminescence quantum yield 62 % doped films. As consequence, endowed its organic light‐emitting diodes 382 FWHM 32 nm, especially record‐high external efficiency (EQE) 15.1 among all kinds devices. Our results demonstrate potential based practical applications including optoelectronics, biology medicine science.

Language: Английский

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Marching Toward Long‐Wavelength Narrowband Emissive Multi‐Resonance Delayed Fluorescence Emitters for Organic Light Emitting Diodes

Advanced Optical Materials, Journal Year: 2023, Volume and Issue: 11(22)

Published: Oct. 4, 2023

Abstract Over the past decade, thermally activated delayed fluorescence (TADF) emitters have garnered tremendous impetus because of their ability to harvest 100% excitons for light emission in organic emitting diodes (OLEDs). However, despite superior external quantum efficiencies (> 35%), broad spectra with associated full‐width‐at‐half maximum (FWHM > 70 nm) present a limiting factor that must be solved. Recently, multiple‐resonance TADF (MR‐TADF) materials based on heteroatom doped polyaromatic hydrocarbons gained astonishing attention owing remarkable narrowband < 30 nm). majority reported MR‐TADF falls blue/green region, which inevitably jeopardizes application full‐color OLEDs. Therefore, there is an urgent need develop new molecular designs expanding color‐gamut emitters, i.e., λ em 550 nm without compromising emission. To best current knowledge, no detailed reviews focusing different design strategies producing long‐wavelength been date. this end, review highlighting recent advances constructing presented, and photophysics OLED performance discussed. Finally, status future prospects are

Language: Английский

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“Core–Shell” Wave Function Modulation in Organic Narrowband Emitters

Journal of the American Chemical Society, Journal Year: 2024, Volume and Issue: 146(27), P. 18331 - 18340

Published: June 20, 2024

Efficient red–green–blue primary luminescence with an extraordinarily narrow band and durability is crucial for advanced display applications. Recently, the emergence of multiple-resonance (MR) from short-range atomic interactions has been shown to induce extremely spectral widths in pure organic emitters. However, achieving wide-range color tuning without compromising purity remains a persistent challenge MR Herein, concept electronic donor/acceptor "core–shell" modulation proposed within boron/nitrogen (B/N) skeleton, enabling rational utilization intramolecular charge transfer facilitate wavelength shift. The dense B atoms localized at center molecule effectively compress electron density stabilize lowest unoccupied molecular orbital wave function. This electron-withdrawing core embedded peripheral electron-donating atoms. Consequently, doping single atom into deep-blue framework led profound bathochromic shift 447 624 nm (∼0.8 eV) while maintaining width 0.10 eV this pure-red emitter. Notably, light-emitting diodes assisted by thermally activated delayed fluorescence molecules achieved superb electroluminescent stability, LT99 (99% initial luminance) exceeding 400 h luminance 1000 cd m–2, approaching commercial-level performance assistance phosphors.

Language: Английский

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Recent Progress of Thermally Activated Delayed Fluorescent Materials with Narrowband Red, Green, and Blue (RGB) Emission

ACS Materials Letters, Journal Year: 2024, Volume and Issue: 6(5), P. 1746 - 1768

Published: April 2, 2024

Narrowband thermally activated delayed fluorescence (TADF) materials have received widespread attention due to their promising applications in organic light-emitting diodes with high-definition displays. Great efforts been done achieve full-color narrowband emissions donor–acceptor (D–A) and multiple-resonance (MR) TADF materials. In comparison the D–A materials, MR-based basically showed smaller full width at half-maximum (fwhm) of spectra owing inherent structural vibration inhibition electronic transition characteristics. Herein, review summarizes current research progress on both MR blue, green red emission regions fwhm less than 70 nm concentrating molecular design strategies, photophysical properties corresponding device performance, proposes some possible future topic. This aims give physical insight structure–property relationship such offer guidance for further developing provide a structured database platform high-throughput or machine learning research.

Language: Английский

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Intrinsic Narrowband Organic Afterglow

Chemistry of Materials, Journal Year: 2024, Volume and Issue: 36(6), P. 3000 - 3012

Published: March 18, 2024

Narrowband organic afterglow materials show application in multiplexed bioimaging and others. However, featuring an intrinsic narrowband with emission lifetime >100 ms remain elusive. We report a serendipitous finding of chemical reaction from aromatic amine to luminescent acridone. Interestingly, upon doping into suitable matrix, acridone molecules display deep-blue full widths at half-maximum <40 nm CIEy < 0.08 under ambient conditions. The originates the multiresonant thermally activated delayed fluorescence (MRTADF) due suppressed vibronic coupling rigid molecular backbone system. Compared conventional ones, here MRTADF emitters feature modest kRISC 1–10 s–1 ultralong ms, which are further fashioned aqueous system exhibiting high color purity, visible-light-excitable property, potential bioapplication.

Language: Английский

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Efficient Ultra‐Narrowband OLEDs Based on Carbazole‐Fused Dual‐Boron Embedded Multi‐Resonance Thermally Activated Delayed Fluorescence Materials

Advanced Optical Materials, Journal Year: 2024, Volume and Issue: 12(15)

Published: Jan. 2, 2024

Abstract The development of efficient multi‐resonance thermally activated delayed fluorescence (MR‐TADF) materials with ultra‐narrowband emission presents an ongoing challenge. In this work, a carbazole‐fused dual‐boron embedded MR‐TADF framework is proposed, achieving three emitters, CFDBO, CFDBA, and CFDBCz, via one‐shot borylation very high yields over 70%. emitters display blue peaks ranging from 452 to 479 nm small full width at half maximum (FWHM) values only 16–18 in dilute toluene solutions. Furthermore, the organic light‐emitting diode (OLED) incorporating CFDBO exhibits pure‐blue peak 460 Commission International de l'Eclairage coordinates (0.14, 0.12). Meanwhile, OLEDs CFDBA/CFDBCz demonstrate remarkable performances external quantum efficiencies 30.9%/32.4% exceptionally slender FWHM 21/22 nm, representing outstanding among reported materials.

Language: Английский

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Synergistic Modulation of Excited State Ingredients and Chiroptical Activity for High‐Performance Pure‐Green Circularly Polarized Electroluminescence

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

Published: May 14, 2024

Abstract The integration of chiral elements within a multiple resonance (MR) motif affords prospective avenue to construct satisfying emitters tailored for state‐of‐the‐art circularly polarized organic light–emitting diodes (CP‐OLEDs). However, the concurrently realizing both high luminescence efficiency and favorable dissymmetry factors ( g PL ) still remains formidable challenge, particularly when aligning with requirement color purity. Herein, dual‐pronged approach is proposed reconcile such trade‐offs by directly fusing secondary donor onto MR scaffold, thereby facilitating hybrid short/long‐range charge‐transfer fine‐tuned compositions. Theoretical calculations unveil pronounced impact on meticulously refining characteristics excited states, therefore yielding considerable 3.3 × 10 −3 , along fluorescence quantum yield 0.97, rapid reverse intersystem crossing rate 3.06 5 s −1 in one embodiment. Leveraging these merits, electroluminescence devices incorporating them as dopants exhibit exceptional performance, showcasing peak external 36.6% remarkable Commission Internationale de L'Eclairage coordinates (0.19, 0.71), which represent most notable achievements among pure‐green CP‐OLEDs.

Language: Английский

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Circularly Polarized Electroluminescence from Intrinsically Axial Chiral Materials Based on Bidibenzo[b,d]furan/bidibenzo[b,d]thiophene

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

Published: June 5, 2024

Abstract Herein, by connecting chiral bidibenzo[ b,d ]furan/bidibenzo[ ]thiophene and multi‐resonance thermally activated delayed fluorescence (MR‐TADF) units, two pairs of intrinsically axial MR‐TADF materials ( R / S ‐ BDBF‐BNO BDBT‐BNO ) realize mirror‐symmetric circularly polarized luminescence (CPL) narrowband emission. The moieties effectively engage in frontier molecular orbital distributions through the establishment covalent bonds with boron atoms. proportions (1,1′‐bidibenzo[ ]furan)‐2,2′‐diol highest occupied lowest unoccupied natural transition orbitals (HONTO/LUNTO) are 25.3% 64.7%, respectively. In addition, processes a dual‐channel mode, thus ]thiophene)‐2,2′‐diol constitutes 22.8%, 24.3% 54.0%, 46.9% HONTO, HONTO‐1 LUNTO, LUNTO+1, high endow good CPL properties dissymmetry factors (| g PL |) 1.7/1.8 × 10 −3 . Correspondingly, organic light‐emitting diodes based on enantiomers exhibit mirror symmetrical electroluminescence | EL 1.5/1.6 Furthermore, introduction sulphur atoms enables to have maximum external quantum efficiency 35.7% device.

Language: Английский

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