Aggregation-Induced Emission Luminogens Realizing High-Contrast Bioimaging

ACS Nano, Journal Year: 2025, Volume and Issue: 19(1), P. 281 - 306

Published: Jan. 2, 2025

A revolutionary transformation in biomedical imaging is unfolding with the advent of aggregation-induced emission luminogens (AIEgens). These cutting-edge molecules not only overcome limitations traditional fluorescent probes but also improve boundaries high-contrast imaging. Unlike conventional fluorophores suffering from aggregation-caused quenching, AIEgens exhibit enhanced luminescence when aggregated, enabling superior performance. This review delves into molecular mechanisms (AIE), demonstrating how strategic design unlocks exceptional and contrast, which crucial for distinguishing healthy diseased tissues. highlights key applications AIEgens, such as time-resolved imaging, second near-infrared window (NIR-II), advancement sensitivity to physical biochemical cue-responsive The development AIE technology promises transform healthcare early disease detection targeted therapies, potentially reshaping personalized medicine. paradigm shift biophotonics offers efficient tools decode complexities biological systems at level, bringing us closer a future where invisible becomes visible incurable treatable.

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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Carbonyl-nitrogen multi-resonance emitters for efficient OLEDs with high color purity

Communications Chemistry, Journal Year: 2025, Volume and Issue: 8(1)

Published: Feb. 4, 2025

Multi-resonance (MR) materials hold an intriguing feature of narrow emission spectra and have attracted considerable attention in the manufacture high-definition organic light-emitting diodes (OLEDs). However, majority MR are composed by a boron-nitrogen skeleton, which is unfavorable for expanding scope luminescent with to meet various application demands. In this work, we wish report new carbonyl-nitrogen (C = O/N) skeleton 5,12-dihydroquinolino[2,3-b]acridine-7,14-dione (QA), three tailored C O/N molecules synthesized fully characterized crystallography, thermal measurement, cyclic voltammetry, steady-state transient spectroscopy theoretical calculation. They show efficient green emissions full width at half maximum (FWHM) about 27 nm high photoluminescence quantum yields up 93% doped films. Efficient hyperfluorescence OLEDs fabricated using these as emitters, providing pure lights electroluminescence peaks 526‒538 nm, FWHMs 29‒33 excellent external efficiencies 29.48% small efficiency roll-offs. These results reveal that QA could be potential exploring molecules. possess spectra, desirable diodes, but most based on limited opportunities expand materials. Here, authors develop multi-resonance yields, further demonstrate their promise through fabrication OLEDs.

Language: Английский

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Intramolecular-Locking Modification Enables Efficient Asymmetric Donor-Acceptor-Donor’ Type Ultraviolet Emitters for High-Performance OLEDs with Reduced Efficiency Roll-Off and High Color Purity

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

Published: Jan. 1, 2025

Developing high-performance ultraviolet organic light-emitting diodes with low efficiency roll-off and high color purity remains challenging due to their inherent wide-bandgap characteristics. In this work, we present an intramolecular noncovalent bond locking strategy modulate donor-acceptor-donor' (D-A-D') type fluorophores (mPImCZ2F, mPIoCZ2F mPImCP2F) a hot-exciton mechanism. Notably, these asymmetric emitters exhibit significantly enhanced bipolar transport capacity fluorescence compared counterparts. Among them, exhibits more remarkable effect multiple C-H⋯F interactions ortho-substitution-induced steric hindrance, which endows it higher radiation rate, narrower emission spectrum, balanced charge transport. Consequently, the mPIoCZ2F-based non-doped device achieves electroluminescence (EL) peak at 393 nm maximum external quantum (EQE) of 6.62%. Moreover, in doped device, emits stable light EL 391 full width half (FWHM) 40 nm, corresponding coordinates (0.167, 0.025). It also exceptionally EQE 8.71% minimal (7.95% 1000 cd m-2), ranking among best efficiencies reported for UV-OLEDs brightness levels.

Language: Английский

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Emission Wavelength and Efficiency Tuning of Monoatomic Multiresonance Emitters Using a Multiresonance Manager

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

Published: March 26, 2025

Abstract A molecular design strategy for managing the emission energy and levels while enhancing efficiency of monoatomic multiresonance (MR) emitters based on a fused indolocarbazole (ICz) chromophore is developed by introducing cyano (CN) unit as an MR manager. The manager intensifies short‐range charge transfer character ICz‐based blue emitter, resulting in pure‐blue with narrow spectrum enhanced photoluminescence quantum yield. As result, CN manager‐modified ICz derivative demonstrates high external (EQE) 23.1%, small full width at half maximum 22 nm, color coordinate (0.142, 0.061). In addition, introduction enables fabrication phosphor‐sensitized fluorescence device EQE 24.6% maintaining spectrum.

Language: Английский

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Aggregation‐Dependent Modulation of Fluorescence Colors

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

Published: April 7, 2025

Abstract This study presents a feasible strategy to modulate fluorescence colors by modulating the molecular aggregation states. It is found that TPA‐BODIPY, derivative of fluorescent dye BODIPY, can exhibit three distinct depending on its state: strong pure green emission with narrow full‐width at half maxima (FWHM) 23 nm in monomer state, yellow FWHM 33 amorphous and red 45 crystal state. The small vibronic coupling electronic excitation process aggregates are elucidated reorganization energy time‐dependent density functional theory. Through manipulating these states polymer matrices, this has successfully achieved modulation from 520 645 composites. composites be conveniently manufactured into various intricate patterns for information encryption. Moreover, high‐purity used as color conversion layers, applied light–emitting devices (LEDs) achieve high performance 123% National Television System Committee (NTSC) gamut 99.5% coverage.

Language: Английский

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Comprehensive Review on the Structural Diversity and Versatility of Multi-Resonance Fluorescence Emitters: Advance, Challenges, and Prospects toward OLEDs

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

Published: May 9, 2025

Fluorescence emitters with a multiple-resonant (MR) effect have become research hotspot. These MR mainly consist of polycyclic aromatic hydrocarbons boron/nitrogen, nitrogen/carbonyl, and indolocarbazole frameworks. The staggered arrangement the highest occupied molecular orbital lowest unoccupied facilitates MR, resulting in smaller internal reorganization energy narrower emission bandwidth. Optimal charge separation suppresses gap between singlet triplet excited states, favoring thermally activated delayed fluorescence (TADF). MR-TADF materials, due to color purity high efficiency, are excellent candidates for organic light-emitting diodes. Nevertheless, significant challenges remain; particular, limitation imposed by alternated core configuration hinders their diversity versatility. Most existing materials concentrated blue-green range, only few red near-infrared spectra. This review provides timely comprehensive screening from pioneering work present. Our goal is gain understandings structure-performance relationship both basic advanced perspectives. Special emphasis placed on exploring correlations chemical structure, photophysical properties electroluminescent performance depth breadth an aim promote future development emitters.

Language: Английский

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Linear Annulation Engineering of Indolocarbazole Multiple Resonance Emitter to Overcome Efficiency‐Stability‐Color Purity Trilemma in Deep‐Blue OLEDs

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

Published: May 9, 2025

Abstract Deep‐blue emitters for organic light‐emitting diodes (OLEDs) still confront the critical challenge of balancing high efficiency, operational stability, and color purity, particularly ones with peak wavelengths ( λ max ) ≤ 460 nm. Here, study demonstrates deep‐blue devices featuring ultrapure emission = 458 nm, full‐width at half‐maximum 19 nm), maximum external quantum efficiency 34.3% small roll‐off (26.9% 1 000 cd m − 2 ; 20.9% 5 ), long LT80 (time to 80% initial luminance) 101 hours 1,000 , being one longest lifetime among OLEDs nm EQE >20%. This breakthrough stems from an indolocarbazole narrowband emitter employing a linear annulation strategy, which not only narrows spectral bandwidth while red‐shifting through multiple resonance framework extension, but also energetically dynamically enhances device longevity via triplet energy reduction. Furthermore, strategic integration steric hindrance on emitting backbone suppresses intermolecular interactions directs reactivity pathways. concurrently achieves 456 FWHM 15 photoluminescence (PL) yield 98% in dilute toluene. The work highlights engineering as potential approach resolve efficiency‐stability‐color purity trilemma OLEDs.

Language: Английский

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Effect of Hydrogen Bonding on Ultrafast Intersystem Crossing in 7-Diethylaminothiocoumarin

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

Published: May 13, 2025

Thiocarbonyls exhibit unique photophysical properties, characterized by rapid intersystem crossing (ISC) due to favorable singlet-triplet energetics and enhanced spin-orbit coupling. However, the role of hydrogen bonding in modulating ISC remains underexplored. This study investigates effect solvent-solute on dynamics 7-(diethylamino)-4-methyl-2-sulfanylidene-2H-chromen-2-one (thiocoumarin 1, TC1) using steady-state time-resolved spectroscopy, complemented theoretical calculations. Experimental data reveal that methanol, leads increased fluorescence quantum yield, prolonged singlet-state lifetime, reduced triplet yield compared aprotic acetonitrile. Time-resolved spectroscopy identifies an additional long-lived emissive singlet state attributed a hydrogen-bonded state, which slows ISC. Theoretical calculations demonstrate alters electronic structure constrains along key nuclear coordinates, including C═S bond vibration dihedral angles, leading decreased formation. These findings provide mechanistic insights into hydrogen-bonding-mediated control thiocoumarins, with implications for designing functional materials tunable properties.

Language: Английский

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Excited‐State Engineering of Chalcogen‐Bridged Chiral Molecules for Efficient OLEDs with Diverse Luminescence Mechanisms

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

Published: Dec. 23, 2024

Abstract The exploration of circularly polarized luminescence is important for advancing display and lighting technologies. Herein, by utilizing isomeric molecular engineering, a novel series chiral molecules are designed to exploit both thermally activated delayed fluorescence (TADF) room‐temperature phosphorescence (RTP) mechanisms efficient luminescence. cooperation small singlet‐triplet energy gap, moderate spin‐orbital coupling (SOC), large oscillator strength enables TADF emission, with photoluminescence quantum yields exceeding 90 %. By altering the symmetry structures, it demonstrated that intrinsic electronic SOC vibrational effects can be greatly enhanced facilitate RTP emission. Notably, through modulating simultaneous emissions, single‐molecule white emission successfully achieved. Accordingly, TADF‐based organic light‐emitting diode (OLED) achieves maximum external efficiency up 30 %, representing exceptional performance non‐aromatic amine‐based emitters. Furthermore, first OLED based on dual‐emissive material developed, establishing benchmark development advanced

Language: Английский

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