Abnormal Slow Phonon Dynamics Toward Prolonging Excited States Dynamics Enabled by Crystalline‐Assembling Donor–Acceptor Molecules

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

Published: March 3, 2025

Abstract Phonon dynamics are a critical factor to control the optical properties of excited states in light‐emitting materials. Here, we report an extremely slow relaxation photoexcited lattice vibrations enabled by assembling donor‐acceptor (D–A) molecules [2‐(9,9‐dimethylacridin‐10(9H)‐yl)‐9,9‐dimethyl‐9H‐thioxanthene 10,10‐dioxide], namely AC molecules, into dipolar crystal. By using photoexcitation‐modulated Raman spectroscopy, find that crystalline‐lattice monitored Raman‐scattering laser beam 785 nm demonstrate un‐usual time scale seconds after ceasing photoexcitation 343 such This presents phonon crystalline‐assembling D–A Simultaneously, photoluminescence (PL) exhibits prolonged behavior, lasting 10 ms phenomenon provides experimental hypothesis function as important mechanism unusually prolong upon can be verified directly suppressing through freezing molecular liquid crystalline solid at 77 K largely PL 1 s‐ removing photoexcitation. Clearly, provide necessary conditions enable toward prolonging dynamics.

Language: Английский

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Highly Bright Pure Room Temperature Phosphorescence for Circularly Polarized Organic Hyperafterglow

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

Published: March 3, 2025

Abstract Pure room‐temperature phosphorescence (pRTP) promises great advantages in both exciton utilization and lifetime manipulation over existing organic luminophores for a variety of emerging applications, but the low brightness, efficiency, color purity constrain afterglow luminescence significantly. Here, promising approach to design highly bright, efficient, narrowband pRTP with long‐lifetime hyperafterglow is proposed by isolating conjugated energy donor circularly polarized (CP) acceptor multi‐resonance effect into rigid host. It shown that aggregation chiral P‐containing binaphthyl promotes generation CP‐pRTP high brightness up ≈50 cd m −2 , while simultaneous transfer chirality afford multi‐color photoluminescence efficiency ≈90%, full‐width at half maxima 31–39 nm, 120–770 ms, luminescent dissymmetry ≈10 −3 . Also, excellent stability capable resisting quenching effects oxygen, solvents, aqueous solutions strong acids bases are observed. With these advantages, applications information encryption, grayscale imaging, 3D high‐resolution models realized, promoting significantly fundamental understandings on modulation construction high‐performance materials advanced photophysical properties applications.

Language: Английский

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Ultralong Room Temperature Phosphorescence through Both Space Confinement and Long-Range Charge Migration

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

Published: March 12, 2025

Doping guest materials into host with a confined space to suppress nonradiative decay is an effective strategy for achieving room-temperature phosphorescence (RTP). However, constructing host–guest doped ultralong RTP (URTP) still challenging. Herein, by embedding three coumarin derivatives boric acid via one-step heat treatment, the URTP material afterglow lasting up 60 s, lifetime of 1.59 and quantum yield 18.14% was successfully prepared. Experimental results show that dense 3D boron oxide network formed after along B–O covalent bonds O→B coordination between guest, effectively suppresses transitions through both physical chemical confinement. More importantly, oxygen vacancy defects in during combined charge-separated states generated molecules upon irradiation, together facilitated long-range charge migration process. In addition, recombination accompanied long-lived emission. Finally, prepared exhibit potential applications encryption decryption information security fields.

Language: Английский

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Achieving Room-Temperature Phosphorescence of Coumarin Derivatives by Hydrogen-Bonding Networks and Multicolor Superfluorescence by Resonance Energy Transfer

Dyes and Pigments, Journal Year: 2025, Volume and Issue: unknown, P. 112765 - 112765

Published: April 1, 2025

Language: Английский

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Lignin-derived carbon dots with molten salt confinement for ultra-stable room-temperature phosphorescence

International Journal of Biological Macromolecules, Journal Year: 2025, Volume and Issue: 310, P. 143180 - 143180

Published: April 15, 2025

Language: Английский

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Aqueous/Chemical‐Resistant Organic Room Temperature Phosphorescence Materials From Siloxane Network Reinforcement

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

Published: April 28, 2025

Abstract Organic room‐temperature phosphorescent(RTP) materials typically exhibit superior luminescent properties, yet their instability, particularly in aqueous environments where phosphorescence is quenched, and under acidic, alkaline, or organic solvent conditions, restricts application. Herein, a novel convenient strategy designed for constructing host–guest RTP by incorporating silane into urea‐derived products to form siloxane network‐strengthened stable host matrix. The possesses excellent chemical stability can be combined with the thermolytic of urea through covalent bonds, enhancing resistance host. connects guest molecules bonds hydrogen restricting non‐radiative loss, phosphorescent emission, protecting from quenching multiple environments. material, prepared using (3‐aminopropyl) triethoxysilane, urea, 2‐aminoterephthalic acid, exhibits blue lifetime 891 ms, visible naked eye 21 s. Notably, it maintains emission water, solvents, strong acid/alkali solutions while demonstrating stability, as evidenced its potential applications afterglow displays information encryption. This provides valuable insights designing broadens application complex

Language: Английский

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Enhancing plant photosynthesis with dual light conversion films incorporating biomass-derived carbon dots

Carbon Capture Science & Technology, Journal Year: 2024, Volume and Issue: 13, P. 100253 - 100253

Published: July 26, 2024

Enhancing photosynthesis is a pivotal strategy for achieving sustainable plant production. Blue and red light facilitate growth since these wavelengths are readily absorbed by chlorophyll pigments power crucial photosynthetic processes. In this investigation, double conversion films were prepared incorporating biomass-derived carbon dots into polyvinyl alcohol matrix (CDs@PVAs). The study conclusively demonstrated that CDs@PVAs can convert ultraviolet green from sunlight blue light. Using 2-week-old Athaliana plants as the model organism, covered with then exposed to simulated (0.57 mW cm−2) 1 hour. Fv/Fm value in presence of was approximately 12% higher than without film, indicating significant boost photosynthesis. Analysis gene expression showed cause upregulation genes associated These thus emerge promising contenders eco-friendly cultivation methods circumvent reliance on electric power. Their potential applications agriculture substantial, underscoring their significance promoting practices.

Language: Английский

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Photo-induced fluorescence discoloration and photo-responsive room temperature phosphorescence carbon dot-based composites with excellent reversibility and water resistance

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: unknown, P. 155972 - 155972

Published: Sept. 1, 2024

Language: Английский

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Exploration and Design of Carbon Dot-Based Long Afterglow Materials Using Active Machine Learning and Quantum Chemical Simulations

ACS Nano, Journal Year: 2024, Volume and Issue: 18(42), P. 29203 - 29213

Published: Oct. 8, 2024

Long afterglow materials based on carbon dots (CDs) have attracted extensive attention in the field of optics due to their low cost and nontoxic properties. However, targeted synthesis specific properties complex unknown structures such as CDs remains a daunting challenge. In this study, powerful nonlinear fitting ability machine learning was used explore CDs. The XGBoost algorithm demonstrates high prediction accuracy determining optimal excitation wavelength, emission lifetime. Using Bayesian optimization, we screened synthesized CDs-based long with longest lifetime reported so far by one-step microwave method. By combining quantum chemical calculations experimental data, revealed structure–function relationship between precursors through electron–hole analysis. These results show that can establish correlations structures, clarify intrinsic relationships, simplify material design process, thus accelerate development advanced materials.

Language: Английский

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Sub‐Nanometer Porous Carbon Materials for High‐Performance Supercapacitors Using Carbon Dots as Self‐templated Pore‐Makers

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

Published: Dec. 26, 2024

Abstract Customizable porous carbon structures are critical for high‐performance electrode materials, and the modulation of pore parameters at different levels remains a great challenge. For supercapacitors, preferred materials should own high specific capacitance, nice rate performance, large density, low self‐discharge, mass‐loading, which could be accomplished by sub‐nanometer pores (0.5–1.0 nm). Herein, new method using dots (CDs) as self‐templates is reported to produce with uniform diameters 0.64–0.80 nm. As result, optimal sample packing density (0.81 g cm −3 ) displays outstanding capacitances (gravimetric 515.5 F −1 , areal 5.16 −2 volumetric 417.6 respectively 1 A commercial‐level mass‐loading 10 mg . The assembled high‐loading symmetric supercapacitor shows energy 22.3 Wh kg 3500 W well long cycle stability (99.9% retention after 000 cycles 2 in an ultrawide voltage range 1.4 V aqueous electrolytes. This work suggests micropore‐forming strategy carbon, can applied batteries, filters, adsorbents, catalysts.

Language: Английский

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