Carbon dot-ZIF-67-infused tragacanth hydrogel films: leveraging tunable luminescence through displacement mechanisms for anthrax detection

Microchimica Acta, Journal Year: 2025, Volume and Issue: 192(2)

Published: Jan. 31, 2025

Language: Английский

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Size Inhomogeneity Facilitates Exciton Dissociation in Carbon Dots

Nano Letters, Journal Year: 2025, Volume and Issue: 25(6), P. 2554 - 2560

Published: Jan. 31, 2025

Organic carbon dots (CDs) exhibit tunable electronic structures and exceptional optical properties, supporting both exciton- charge-driven applications. However, the mechanisms underlying this dual functionality are poorly understood. This study establishes role of size inhomogeneity in exciton dissociation for first time. Two distinct CD types were identified, each class with a deviation. Intradot relaxation within same type CDs composes fast (∼1 ps) slow (∼tens picoseconds) component among size-deviated subpopulations. Interdot transfer between two occurs time scale 4.4 ps but is evident only when higher-energy states excited. It also facilitates dissociation, generating nearly free carriers, confirmed by EPR spectra (g-value = 2.005). These findings highlight critical energy level alignment selective excitation mediating providing key insights optimizing light emission conversion

Language: Английский

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Revealing the in-situ growth mechanism of carbon dots confined in ZIF-8 as multicolor fluorescent material with high photothermal stability

Journal of Colloid and Interface Science, Journal Year: 2025, Volume and Issue: 688, P. 172 - 182

Published: Feb. 18, 2025

Language: Английский

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Low-temperature molten salt enabled synthesis of solid-state emissive carbon dots with high endurance and >99% quantum yields

Research Square (Research Square), Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 19, 2025

Fluorescent carbon dots (CDs) have garnered significant attention for their unique optoelectronic properties and applications, but practical employment is hampered by the excessive synthesis temperature, tedious post-processing limited solid-state luminescence efficiency. Herein, we develop a facile molten salt method to achieve one-step of full-color CDs with efficient emission. Comprehensively, kilogram-scale quantum yield 90% can be readily synthesized via salt-assisted approach under mild conditions (100–142°C) within 10 minutes. The spectral characterization density functional theory calculation confirm that zinc ion coordination occur in liquated environment, which facilitates polymerization precursors at lower temperatures, suppresses formation non-radiative recombination channels on surface, further enhances solid. machine learning used optimize CDs’ luminous efficiency up 99.86%, evoking excellent performance CDs-based light-emitting diodes maximum 156.29 lm W^–1 drive backlit display long-persistent lifetime (T₉₅ 100 cd m^–2 = 45108.7 h). This work provides pathway design fabrication advanced carbon-based luminescent materials, significantly contributing advancement next-generation lighting technologies.

Language: Английский

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Tuning phase transition and fluorescence quenching in 0D organic–inorganic hybrid materials by precise organic cation modification

Dalton Transactions, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

Three novel organic–inorganic hybrids exhibit increased phase transition temperatures and distinct temperature-dependent fluorescence quenching by progressive organic group substitution.

Language: Английский

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