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 progress and prospects of fluorescent materials based on narrow emission

Journal of Materials Chemistry C, Journal Year: 2023, Volume and Issue: 11(20), P. 6471 - 6511

Published: Jan. 1, 2023

MR-TADF emitters with narrow emission have been developed and are expected to become fourth-generation for HD-OLEDs, molecular design guidelines commercial prospects outlined in this review.

Language: Английский

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Is a small singlet–triplet energy gap a guarantee of TADF performance in MR-TADF compounds? Impact of the triplet manifold energy splitting

Journal of Materials Chemistry C, Journal Year: 2024, Volume and Issue: 12(10), P. 3450 - 3464

Published: Jan. 1, 2024

A design strategy for efficient MR-TADF emitters needs (i) avoiding aggregation by inducing steric hindrance at peripheral strategic positions, and (ii) combining lateral groups of higher donor character as compared to the central core.

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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An Efficient Ultra‐Narrowband Yellow Emitter Based on a Double‐Boron‐Embedded Tetraazacyclophane

Angewandte Chemie International Edition, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 3, 2025

Abstract Ultra‐narrowband and highly modifiable multiple resonance thermally activated delayed fluorescence (MR‐TADF) materials are crucial for realizing high‐performance wide‐color‐gamut display applications. Despite progress, most MR‐TADF emitters remain confined to blue green wavelengths, with difficulties extending into longer wavelengths without significant spectral broadening, which compromises color purity in full‐color organic light‐emitting diode (OLED) displays. In this work, we present a novel tetraazacyclophane‐based architecture embedding dual boron atoms remarkedly enhance intramolecular charge transfer through the strategic positioning of nitrogen atoms. This arrangement induces substantial redshift while maintaining structural rigidity molecular orbital symmetry, hole‐electron central distance 0 Å, allowing ultra‐narrowband emission. The resulting material, HBN , delivers yellow emission peaking at 572 nm (2.168 eV) an impressively narrow full‐width half‐maximum (FWHM) 17 (0.064 dilute toluene. Moreover, corresponding phosphorescent‐sensitized OLED achieves maximum 581 nm, FWHM 25 high external quantum efficiency 36.1 %, luminance exceeding 40,000 cd m −2 . These outstanding photoluminescent electroluminescent performances validate superiority our design strategy, highlighting its potential cutting‐edge optoelectronic

Language: Английский

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Combining Carbazole Building Blocks and ν‐DABNA Heteroatom Alignment for a Double Boron‐Embedded MR‐TADF Emitter with Improved Performance

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(32)

Published: June 13, 2023

Building blocks and heteroatom alignments are two determining factors in designing multiple resonance (MR)-type thermally activated delayed fluorescence (TADF) emitters. Carbazole-fused MR emitters, represented by CzBN derivatives, the of ν-DABNA star series MR-TADF emitters that show impressive performances from aspects building alignments, respectively. Herein, a novel analog, Π-CzBN, featuring alignment is developed via facile one-shot lithium-free borylation. Π-CzBN exhibits superior photophysical properties with photoluminescence quantum yield close to 100 % narrowband sky blue emission full width at half maximum (FWHM) 16 nm/85 meV. It also gives efficient TADF small singlet-triplet energy offset 40 meV fast reverse intersystem crossing rate 2.9×105 s-1 . The optimized OLED using as emitter achieves an exceptional external efficiency 39.3 low roll-off 20 1000 cd m-2 495 nm FWHM 21 nm/106 meV, making it one best reported devices based on comprehensive performance.

Language: Английский

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Narrowband Near‐Infrared Multiple‐Resonance Thermally Activated Delayed Fluorescence Emitters towards High‐Performance and Stable Organic Light‐Emitting Diodes

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 63(7)

Published: Dec. 27, 2023

Multiple-resonance thermally activated delayed fluorescence (MR-TADF) materials are highly coveted for their high efficiency and narrowband emission in organic light-emitting diodes (OLEDs). Nevertheless, the development of near-infrared (NIR) MR-TADF emitters remains a formidable challenge. In this study, we design two new NIR emitters, PXZ-R-BN BCz-R-BN, by embedding 10H-phenoxazine (PXZ) 7H-dibenzo[c,g]carbazole (BCz) fragments to increase electron-donating ability or extending π-conjugation on framework para-boron fusing polycyclic aromatic hydrocarbons (PAHs). Both compounds emit region, with full-width at half-maximum (FWHM) 49 nm (0.13 eV) 43 (0.11 BCz-R-BN toluene. To sensitize OLEDs, platinum complex, Pt-1, is designed as sensitizer. The PXZ-R-BN-based sensitized OLEDs achieve maximum external quantum (EQE

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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Förster Resonance Energy Transfer: Stimulus‐Responsive Purely Organic Room Temperature Phosphorescence through Dynamic B−N bond

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(20)

Published: Feb. 28, 2024

Abstract Recently, stimulus‐responsive organic materials with room‐temperature phosphorescence (RTP) properties have attracted significant attention owing to their potential applications in chemical sensing, anticounterfeiting, and displays. However, molecular design currently lacks systematicity effectiveness. Herein, we report a capture‐release strategy for the construction of reversible RTP via B/N Lewis pairs. Specifically, acid 7‐bromo‐5,9‐dioxa‐13b‐boranaphtho[3,2,1‐de]anthracene (BrBA) can be deactivated through capturing by base, N , ‐diphenyl‐4‐(pyridin‐4‐yl)aniline (TPAPy), reactivated dissociation B−N bonds release BrBA. Reversible is attributed exceptional self‐assembly capability BrBA, whereas tunable colors are derived from distinct Förster resonance energy transfer (FRET) processes. The information storage anti‐counterfeiting were also experimentally validated. approach proposed this study offers an effective designing materials.

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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