Hybrid Local and Charge‐Transfer Material with Ultralong Room Temperature Phosphorescence for Efficient Organic Afterglow Light‐Emitting Diodes

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(45)

Published: July 26, 2024

Organic ultralong room temperature phosphorescence (OURTP) materials capable of combining various emission behaviors for diversified optoelectronic properties and applications have recently gained a vigorous development, but it remains forbidden challenge in designing OURTP molecules with hybrid local charge-transfer (HLCT) feature, possibly due to the elevated difficulties simultaneously meeting stringent requirements both HLCT emitters. Here, through introducing multiple heteroatoms into one-dimensional fused ring coumarin moderate charge transfer perturbation donor-π-acceptor architecture, we demonstrate HLCT-featured molecule showing promoted fluorescence quantum yield 77 % solution long-lived lifetime 251 ms conventional host material used electroluminescent device. Thus, efficient organic light-emitting diodes (OLEDs) were fabricated, exhibiting bright electroluminescence an exciton utilization efficiency 85 yellow lasting over 2 s afterglow. Impressively, OURTP-OLEDs can be further optimized reach unprecedented total external (EQE) ~12 EQE up 3.11 %, representing highest performance among reported OURTP-OLEDs. These impressive results highlight significance fuse together enriching improving afterglow OLED performances.

Language: Английский

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Red/near-infrared light triggered photorelease via sensitized photolysis

Coordination Chemistry Reviews, Journal Year: 2024, Volume and Issue: 518, P. 216117 - 216117

Published: July 27, 2024

Language: Английский

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Ultralong Blue Organic Room‐Temperature Phosphorescence Promoted by Green Assembly

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(46)

Published: July 9, 2024

Abstract In recent years, there is a growing interest in developing ultralong organic room‐temperature phosphorescence (ORTP) with lifetimes the range of seconds. As one important three primary colors, blue ORTP an indispensable core component RTP regulation and application, however, large Stokes shift characteristics pose certain challenges ORTP. Here, new family phosphors are synthesized realized through crystal assembly water phase. Remarkably, compared to materials obtained phases, enabled long‐lived up 2.3 s quantum yield reached as high 29.27%. addition efficient green form, such dark possessed thermal stability flexible tunability. Moreover, superiority selected components demonstrated by comparing them polymer proposed show great potential programmable information encryption/anti‐counterfeiting.

Language: Английский

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Long-Wavelength Afterglow Emission with Nearly 100% Efficiency through Space-Confined Energy Transfer in Organic-Carbon Dot Hybrid

Nano Letters, Journal Year: 2024, Volume and Issue: 24(42), P. 13307 - 13314

Published: Oct. 10, 2024

Long-wavelength afterglow emitters are crucial for optoelectronics and information security; however, it remains a challenge in achieving high luminescence efficiency due to the lack of effective modulation electronic coupling nonradiative transitions singlet/triplet excitons. Here, we demonstrate an organic-carbon-dot (CD) hybrid system that operates via space-confined energy transfer strategy obtain bright emission centered at 600 nm with near-unity efficiency. Photophysical characterization theoretical calculation confirm efficient can be assigned synergistic effect intermolecular from triplet excitons CDs singlets subluminophores intense restraint decay losses singlet/triplet-state rationally rigidification amination modification. By utilizing precursor engineering, yellow near-infrared 575 680 efficiencies 94.4% 45.9% has been obtained. Lastly, these highly emissive powders enable superior performance lighting security.

Language: Английский

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Intrinsic Narrowband Blue Phosphorescent Materials and Their Applications in 3D Printed Self‐monitoring Microfluidic Chips

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

Published: Oct. 18, 2024

Organic room-temperature phosphorescent (RTP) materials, especially with narrowband emission properties, exhibit great potential for applications in display and sensing, but have been seldom reported. Herein, a rare example of the intrinsic blue RTP material is fabricated A series indolo[3,2,1-kl]phenothiazine derivatives, named Cphpz, 1O-Cphpz, 2O-Cphpz, are designed synthesized. Due to their relatively rigid structures, these three compounds showed deep emissions ranging from 396 434 nm full width at half maximum (FWHM) 31, 26, 31 nm, respectively. To delight, compound 2O-Cphpz displayed 448 FWHM 36 long-lived lifetime 1.08 s hydroxyethyl acrylate acrylic acid matrix. Photophysical studies, single crystal analyses, TD-DFT calculations performed elucidate further relationships between molecular structures properties. Meanwhile, because highly sensitive humidity, visualizing droplet path optical microfluidic chip efficiently through digital light processing 3D printing.This work provides reliable strategy realize expand self-monitoring printed structures.

Language: Английский

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Organic high-temperature afterglow materials: an advancing and impactful research area

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

Published: Jan. 2, 2025

Language: Английский

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High-Efficiency, Long-Lived, Multicolor Tunable Pure Organic Materials for Dual Fluorescent-Phosphorescent Emission at Room Temperature

ACS Applied Optical Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 10, 2025

Currently, numerous afterglow materials often suffer from low phosphorescence quantum yields (ΦPh) and are confined to a singular luminescent color. In this study, we devised an approach by incorporating four distinct carbazole derivative guest molecules, featuring varying degrees of halogen substitution naphthalene group sites, into β-estradiol host molecules through high-temperature melt doping create exceptional organic composites. Remarkably, all exhibit characteristics, including prolonged lifetimes ultrahigh yields, with the pinnacle lifetime soaring 904.76 ms peak yield achieving remarkable 40.0%. Notably, even without heavy atom incorporation, phosphors managed attain ΦPh 18.0%, underscoring their unique properties. Furthermore, our experiments unveiled intriguing phenomenon: rather than single fluorescence or emission, these dual-emission encompassing both phosphorescence. The versatility in luminescence color manipulation was further demonstrated adjusting temperature excitation wavelength, offering unparalleled flexibility. Moreover, hues could be finely tuned number atoms, adding another layer tunability. Theoretical calculations provided valuable insights, showing that changes bromine substitutions positions significantly affect molecule's spin–orbit coupling constants nature its excited states. This understanding not only highlights molecular mechanisms behind observed properties but also provides roadmap for future design optimization such advanced materials.

Language: Английский

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High-Temperature Phosphorescence of Carbon Dots by a Synergistic Locking Strategy

ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: unknown

Published: April 7, 2025

Phosphorescent materials have potential applications in anticounterfeiting and optoelectronics, but their luminescence is generally quenched at elevated temperatures. Herein, a synergistic locking strategy has been developed to achieve high-temperature phosphorescence (HTP) of carbon dot (CD) composites. Impressively, the CD composites retain over 90% 75% intensity temperatures up 110 170 °C, respectively. Even higher than persists for 5 s, demonstrating remarkable stabilization triplet excitons. Experimental theoretical results revealed that this outstanding thermal resistance stems from effect interlayer covalent bridges multiple hydrogen bonding interface. Furthermore, by adjusting degree graphitization, multicolor HTP ranging blue red achieved This work not only provides facile versatile way construct CD-based also expands heat-resistant display environments.

Language: Английский

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High‐Temperature‐Available Organic Blue Phosphorescence for Optical Waveguide

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

Published: May 6, 2025

Abstract Organic phosphorescence holds significant potential for its important applications in sensors, optoelectronics, and security technologies. However, achieving long‐lived blue phosphorescence, particularly at high temperatures, remains a challenge. In this work, an unusual thermally enhanced is investigated observed readily synthesized polymer (P1), which created by copolymerizing acrylamide with phenyl terpyridine‐containing monomer (M1). Remarkably, P1 exhibits ultra‐long cyan 493 nm lifetime of 1.04 s room temperature 450 when exposed to 150 °C. Experimental simulation results suggest that the high‐temperature originates from activated rotation terpyridine group, triggering conformational transition low‐energy Iso2 high‐energy Iso3 state. Furthermore, heat‐resistant phosphorescent can be easily fabricated into optical waveguide low loss coefficient, making it suitable high‐performance switches. This work provides novel strategy designing high‐temperature‐resistant materials, promising advanced photonic optoelectronic devices.

Language: Английский

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Ion-Radical Mediated Multi-Color Ultra-Long Afterglow Materials

Published: April 30, 2024

Pure organic persistent room temperature phosphorescence (RTP) has shown great potential in numerous applications, ranging from information encryption and display technologies to bio-applications beyond. In this work, a suite of multi-color long-lived RTP materials featuring distinct afterglow emissions was constructed using an ion-radical mediated approach. b[c]p/MeBPO emitted vivid yellow centered at 560 nm with impressively long lifetime 860.01 ms. While compound b[a]a exhibited near-infrared (NIR) (τ = 215.96 ms) after doping into the matrix. The transient absorption spectroscopy investigations disclosed that observed phenomenon fundamentally tied generation radical ions rather than exciplex. These resulted reduction quenching process triplet excited state BPO by ground agent. A novel evaluation methodology devised, rooted Marcus theory, gauge specific dopant-matrix combination towards generating pronounced afterglow. According framework, enhancement is directly proportional decrease activation energy (ΔG≠) associated electron transfer reaction occurring between dopant Notably, when ΔG≠ surpasses 30 kcal/mol, no observable occurs, as higher values significantly impede two components. Furthermore, system exhibits exceptional sensitivity, low 0.02‰ molar ratio host material. This remarkable dependence intensity on concentration renders bi-component highly promising for applications requiring ultra-high sensitivity broad-spectrum detection capabilities.

Language: Английский

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