“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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Sulfur-locked multiple resonance emitters for high performance orange-red/deep-red OLEDs

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

Published: Jan. 2, 2025

Language: Английский

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Modulation of Carbazole/Phenol Resonant Partners within Diboron‐Based Multi‐Resonance Emitters Enable High‐Performance Narrowband Green to Red OLEDs

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(28)

Published: March 10, 2024

Abstract Diboron‐based multi‐resonance (MR) molecules featuring para ‐B‐π‐B configuration represent a highly promising class of emitters for red and near‐infrared organic light‐emitting diodes (OLEDs). The emission spectra the diboron‐based MR can be fine‐tuned by modulating carbazole/phenol resonant partners. However, beyond spectral tuning, comprehensive understanding intricate relationship between molecular structure, overall properties remains elusive. In this work, through meticulous design precise material synthesis, study has constructed three new completed establishment family involving counterpart. These facilitate systematic investigation into impact partners on critical such as thermally activated delayed fluorescence, full‐width at half‐maximum, horizontal orientation ratio. Eventually, employing these emitters, high‐performance narrowband emitting OLEDs with maximum external quantum efficiencies (EQE max s) 30.2%, 33.0%, 37.0% are fabricated green, yellow, devices, respectively, together exceptional operational lifetimes. particular, both yellow exhibit unprecedented low‐efficiency roll‐off, maintaining high EQEs over 30% 25% ultrahigh brightness levels 10 000 100 cd m −2 , respectively.

Language: Английский

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Rigidity‐Enhanced Narrowband Iridium(III) Complexes with Finely‐Optimized Emission Spectra for Efficient Pure‐Red Electroluminescence

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

Published: March 24, 2024

Abstract Attaining phosphorescent materials with narrowband emission is crucial for advancing wide‐color‐gamut organic light‐emitting diode (OLED). Herein, a rigid modification strategy introduced iridium(III) complexes to achieve the red negligible 0–1 peak. By introducing indolo[3,2,1‐ jk ]carbazole (ICz) into cyclometalated ligand, Ir(III) complexes, ICziq‐Ir and ICzqz‐Ir, exhibit pure phosphorescence peaks at 608 613 nm full widths half‐maximum (FWHMs) of 37 38 (0.12 0.13 eV) in toluene, respectively. Furthermore, specific site ICzqz‐Ir greatly suppresses high‐frequency vibration structure, resulting photoluminescent spectrum close Gaussian distribution superior color purity. The OLEDs utilizing demonstrate maximum external quantum efficiencies 21.4 17.8% as well mild efficiency roll‐off. Remarkably, electroluminescence spectra similar FWHMs 43 CIE coordinates (0.65, 0.35) (0.66, 0.34), attesting excellent purity OLEDs.

Language: Английский

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Thermally activated delayed fluorescence materials: innovative design and advanced application in biomedicine, catalysis and electronics

RSC Advances, Journal Year: 2025, Volume and Issue: 15(10), P. 7383 - 7471

Published: Jan. 1, 2025

Thermally Activated Delayed Fluorescence (TADF) materials have emerged as a revolutionary class of functional compounds, driven by their unique ability to utilize excitons from both singlet and triplet states for efficient fluorescence emission. This manuscript provides an overview recent innovations in TADF material design, focusing on molecular strategies achieve optimal properties, including small singlet-triplet energy gaps (ΔE ST) high photoluminescence quantum yields. We explore the diverse applications materials, spanning OLEDs, biomedical imaging, photosensitizers, photocatalysis, UV photodetectors (UVOPDs), electrogenerated chemiluminescence, triplet-triplet annihilation (TTA) sensitizers, organic hybrid microwire radial heterojunctions, multicolor luminescent micelles, mechano-luminescence (ML), light-emitting electrochemical cells (LEECs), fluorescent probes. The integration these technologies highlights potential enhance performance efficiency. Through this review, we aim elucidate fundamental principles governing behavior present forward-looking perspective synthetic methodologies new, versatile materials.

Language: Английский

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Fused nonacyclic carbonyl/nitrogen-containing multi-resonance emitters with simultaneously redshifted and narrowed emission spectra for high-efficiency solution-processed OLEDs

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 160102 - 160102

Published: Feb. 1, 2025

Language: Английский

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Spiro‐Carbon‐Locking and Sulfur‐Embedding Strategy for Constructing Deep‐Red Organic Electroluminescent Emitter with High Efficiency

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 4, 2024

Abstract The discovery of multiple resonance thermally activated delayed fluorescence (MR‐TADF) materials with remarkable narrowband emission has opened a new avenue for the development organic light‐emitting diodes (OLEDs) high color purity. However, lack construction strategies purely red MR‐TADF significantly impedes their application in full‐color high‐definition displays. Herein, we propose unique and handy approach spiro‐carbon‐locking sulfur‐embedding strategy to modify parent framework, resulting emitter reported molecule (namely, FSBN) demonstrates pure an maximum 621 nm toluene solution. OLED FSBN as exhibits Commission Internationale de l’Éclairage (CIE) coordinates (0.67, 0.33), which exactly matches standard defined by National Television Standards Committee (NTSC). Importantly, single‐host achieves power efficiency (PE) up 50.1 lm W −1 , suggesting potential low consumption OLEDs.

Language: Английский

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Recent breakthroughs in non-conjugated polymers for thermally activated delayed fluorescent OLEDs: emitters, hosts, and hole-transport materials

Materials Chemistry Frontiers, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 20, 2024

Non-conjugated linkers interrupt direct conjugation in the polymer backbone, providing enhanced solubility, blue TADF emitters, and high triplet energy host hole transport materials.

Language: Английский

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High‐Performance Red OLEDs Enabled by an Organoboron‐Nitrogen‐Carbonyl‐Hybridized Multiresonant Emitter

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

Published: Jan. 17, 2025

Abstract Organoboron‐nitrogen‐carbonyl‐hybridized ( h ‐BNCO) frameworks are emerging templates for developing high‐performance multiresonant (MR) emitters, but their potentials have not been fully explored. In this study, a novel red MR emitter, namely, ‐BNCO‐3, is developed by decorating two diphenylamine moieties onto ‐BNCO skeleton ‐BNCO‐2). Compared with the green backbone, ‐BNCO‐3 achieves substantial emission redshift of 76 nm while retaining narrow full width at half maximum (FWHM) 45 (0.16 eV) in toluene. Moreover, common advantages integrating carbonyl group B/N‐based systems, e.g., significant nπ * contribution triplet manifolds, obvious ‐BNCO‐3. Thus, obtained fast reverse intersystem crossing rate k RISC ) over 10 5 s −1 . The optimized non‐sensitized organic light‐emitting diode (OLED) based on achieved an external quantum efficiency (EQE) 26.4%. further employing phosphor as sensitizer, ‐BNCO‐3‐based OLED can reach impressive EQE 38.0%, which among best results MR‐OLEDs. This work demonstrates effectiveness into organoboron‐nitrogen‐based peripheral decorations enhancing , offering new insights emitters systems.

Language: Английский

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Efficient harvesting of triplet excitons via multiple fast TTA up-conversion and high-lying reverse intersystem crossing channels for efficient blue fluorescent organic light-emitting diodes

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

Published: Jan. 1, 2025

A high efficiency blue OLED with fast TTA up-conversion and highly-lying reverse intersystem crossing channels was successfully fabricated. The maximum EQE reached 11.4% CIE coordinates of (0.13, 0.11).

Language: Английский

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