Achieving High‐Performance Organic Long Persistent Luminescence Materials via Manipulation of Radical Cation Stability

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

Published: Feb. 22, 2025

Abstract Organic long persistent luminescence (OLPL) materials, with their hour‐long afterglow, hold great promise across numerous applications, yet performance lags behind that of inorganic counterparts. A deeper understanding the underlying photophysical mechanisms, particularly effective control radical intermediates, is essential for developing high‐performance OLPL materials; while systematic studies on intrinsic stability intermediates and impact remain scarce. Here biphenyl groups introduced into a luminophore‐matrix‐donor three‐component system. By varying substituents at ortho‐position groups, cations systematically modulated, influence properties investigated. Combined experimental results theoretical calculations reveal increased flexibility bond adjustable conformations lead to higher cations, thereby significantly enhancing performance. Based this understanding, luminophore two designed successfully achieve remarkable afterglow brightness close Sr 2 Al 14 O 25 /Eu 2+ , Dy 3+ materials. Furthermore, these materials exhibit time‐encoded promising applications in advanced anti‐counterfeiting, as well background‐independent bioimaging functions. This work not only provides novel strategy constructing but also lays foundation widespread application various fields.

Language: Английский

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Ultralong Afterglow of Zinc(II) Halide Complexes Enabled by Regulating the Arrangements of N‐Methylbenzimidazole Ligands

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

Published: April 1, 2025

Abstract In this study, a simple and rapid strategy is developed for the gram‐scale synthesis of zinc(II) halide complexes with ultralong afterglow under mild conditions. Crystalline, high‐purity are synthesized using N ‐methylbenzimidazole ( Bz ) common zinc salts (ZnX 2 , X = Cl, Br, I) as cheap industrial raw materials by stirring at room temperature atmospheric pressure. By exploiting steric effect terminal‐coordinated halogen ions to regulate arrangements ligands in structure complexes, namely cis ‐butterfly, trans cross ‐arrangement, completely differentiated stacking modes obtained. Zn(Bz)Cl ‐butterfly‐shaped arrangement has longest room‐temperature phosphorescence (RTP) lifetime (505.01 ms 298 K) long up 1.4 s. This study proposes first time use end group coordination fluorophores within resulting considerably improved RTP afterglow, thus providing new platform large‐scale afterglow.

Language: Английский

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Tuning Molecular Packing by Twisting Structure to Facilely Construct Highly Efficient Solid‐State Fluorophores for Two‐Photon Bioimaging and Photodynamic Therapy

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(27)

Published: March 7, 2024

Abstract The traditional design strategy for constructing highly bright solid‐state luminescent materials relies on incorporating aggregation‐induced emission (AIE) scaffolds, molecular rotors, or bulky substituents to prevent close cofacial packing, which limits the diversity in developing new materials. Herein, a of tuning packing by twisting structure conventional aggregation‐caused quenching fluorophore is proposed endow with AIE effect and enhance fluorescence. Accordingly, series 1,4‐bis(diphenylamino)‐2,5‐disubstituted benzene fluorophores exhibiting characteristics, high fluorescence efficiency (up 0.99), wide color tunability, good near‐infrared (NIR) two‐photon absorption facilely developed. All these luminogens can specifically stain intracellular lipid droplets signal‐to‐noise ratio, biocompatibility, photostability. Besides, exhibit effective reactive oxygen species (ROS) generation capability upon low‐power white light irradiation. Among them, luminogen, named BDBDC, integrating NIR emission, strongest ROS demonstrates superior performances imaging various tissues photodynamic cancer therapy. This philosophy provides way designing practical applications.

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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Hectogram‐Scale Synthesis of Visible Light Excitable Room Temperature Phosphorescence Carbon Dots

Small, Journal Year: 2024, Volume and Issue: 20(46)

Published: Aug. 2, 2024

Abstract Carbon dots (CDs) based room temperature phosphorescence (RTP) materials can be prepared via facile procedures and exhibit excellent photostability biocompatibility. Furthermore, doping of hetero‐atoms into CDs afford multiple triplet levels. The RTP emission generated from the resultant always displays outstanding dynamic behaviors even efficiently excited by visible light. Given this, CDs‐based not only used for anti‐counterfeiting but also great application potential in signage illumination fields. In this contribution, a type B, N, P co‐doped are hectogram scale. Upon excitation UV lamp white LED, obtained emit green yellow RTP, respectively, lifetime which 851 481 ms, respectively. It is found that luminescence color further tuned. By controlling degree carbonization, facilely tuned to orange‐red. Based on an energy transfer strategy, red. Benefited visible‐excited colorful emission, these anti‐counterfeiting, fingerprint collection, luminescent traffic explored.

Language: Английский

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Photoreversible Shape Memory Polyurethane Films Prepared Using Demulsification-Induced Fast Solidification for Multilevel Information Encryption Application

ACS Applied Polymer Materials, Journal Year: 2024, Volume and Issue: 6(10), P. 5788 - 5802

Published: May 6, 2024

This study introduces waterborne polyurethane (WPU) films with defined shape memory and multistimuli responsive properties for information encryption. The feature is attributed to the semicrystalline structure of polycaprolactone (PCL) serving as soft segment in WPU. Incorporating photoreversible moiety 9-anthracenemethanol (9-An) impacts photoresponsive characteristics enhances tensile strength film after 1 h ultraviolet irradiation. demulsification-induced fast solidification (DIFS) method offers rapid preparation, controllable thicknesses, multidimensional shapes, surpassing conventional cast method. Cellulose nanocrystals (CNCs) render WPU composite solvent-sensitive, inducing color changes through cholesteric pitch alterations. resulting combination photo- solvent-sensitivity attribute positions promising candidates multilevel encryption, offering an approach functional polymer development.

Language: Английский

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Chiral Polymer‐Organic Molecule Composite with Circularly Polarized Thermally Activated Delayed Fluorescence and Room‐Temperature Phosphorescence by Bridging Effect of Hydrogen Bond

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(45)

Published: June 9, 2024

Abstract Circularly polarized luminescence is essential to chiral and photonic science, but achieving circularly thermally activated delayed fluorescence (CP‐TADF) room‐temperature phosphorescence (CP‐RTP) simultaneously remains a great challenge. This because it difficult satisfy the stable triplet exciton, appropriate energy gap, regular environment. Herein, simple strategy reported construct persistent photoluminescent system, which can achieve TADF RTP by suppressing non‐radiative transition decay of exciton through intermolecular hydrogen bonding between acridine flavin (AF) rigid polymer network. The composite exhibited ultra‐long lifetimes high quantum yields. Then, rarely multi‐circularly photoluminescence system containing CP‐TADF CP‐RTP constructed co‐assembly cellulose nanocrystals, polyvinyl alcohol, AF. By utilizing cholesteric structure, band gap crystals, stabilization mechanism light emitter polymer, films rare optical properties simultaneously: emission, tunable dissymmetric factor, significant yield, ultralong lifetimes, are not before broaden perspective for luminescence.

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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Pure Organic Thermally Activated Delayed Fluorescence Afterglow Polymers via Dopant Isomerization

ACS Macro Letters, Journal Year: 2025, Volume and Issue: unknown, P. 265 - 271

Published: Feb. 13, 2025

N-(o-Cyanophenyl)carbazole can be dimerized at different positions, which may change excited state behaviors. Herein, 2,3′-dicyano-3,4′-di(carbazol-9-yl)biphenyl (D34C) is designed and synthesized doped into polymers. However, we find that D34C does not exhibit room temperature phosphorescence but emits fluorescence (FL) bright thermally activated delayed (TADF) with lifetimes of hundreds milliseconds, observed in diverse matrices such as PMMA, MBS, ABS, PS, HIPS, SIS. The simple positional isomerization makes the abundant triplet excitons undergo only reverse intersystem crossing rather than (RTP) radiation, rare organic Since production TADF afterglow requires a certain excitation time, generally indistinguishable FL efficiencies are separated for first time. This work provides novel polymers mechanical properties also will evoke subtle design conjugated molecules to dramatically photoexcitation emission

Language: Английский

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Delignification of wood and infiltration with alumina/polyvinylpyrrolidone nanofiber-reinforced nanocomposite toward photoluminescent smart window for detection and filtration of ultraviolet radiation

Journal of Photochemistry and Photobiology A Chemistry, Journal Year: 2025, Volume and Issue: unknown, P. 116456 - 116456

Published: April 1, 2025

Language: Английский

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