Decisive role of organic fluorophore and surface defect state in the photoluminescence of carbon quantum dots DOI

Chao Jiang,

Xifang Chen,

Xiaowen Zhang

et al.

Applied Physics Letters, Journal Year: 2024, Volume and Issue: 125(22)

Published: Nov. 25, 2024

Carbon quantum dots (CQDs) hold significant promise for applications in biological imaging, sensing, and optoelectronic devices owing to their superior photostability low toxicity. Nevertheless, the elucidation of photoluminescence mechanism remains an open question, necessitating further comprehensive investigation. In this Letter, CQDs exhibiting ultraviolet (UV) white fluorescence were isolated through silica gel column chromatography separation crude product obtained from a one-step solvothermal synthesis. with different luminescent properties exhibit same crystal structure similar particle size distributions. Both orthorhombic where C60/C70 molecules are located at lattice points, having average sizes 2.71 2.98 nm, respectively. Consequently, synthesized predominantly governed by surface structure. The results microstructure characterization spectroscopic analysis demonstrate that UV emission originates C(=O)OH C–O–C related moieties within organic fluorophores, blue band is attributed defect states group C–O–C, while green/yellow arises C(=O)O levels. These observations have gained profound understanding genesis CQDs, broadened luminescence coverage wavelength range enriched family materials.

Language: Английский

Cutting-edge innovations in red carbon dots: Synthesis, perfection, and breakthroughs in optoelectronics and electrocatalysis DOI

Mingying Chen,

Junjie Ma, Congjin Chen

et al.

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 498, P. 155302 - 155302

Published: Aug. 29, 2024

Language: Английский

Citations

22
Engineering Solid‐State Fluorescent Carbon Dots with Aggregation‐Induced Emission by Fatty Amine Chains‐Regulated Charge Transfer and π‐π Stacking DOI Open Access

Canpu Yang,

Jiusheng Hu,

Wenjiang Tan

et al.

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

Published: Jan. 16, 2025

Abstract Carbon dots (CDs) are an encouraging green luminescent material; however, the aggregation‐caused quenching (ACQ) effect poses a significant limitation for their use in solid‐state devices. By adjusting precursor fatty amine chains, this paper synthesized four emissive CDs with aggregation‐induced emission (AIE) properties (Lx‐CDs). When water is introduced, generation of Lx‐CDs aggregates creates switching off carbon‐core (blue) acetic acid solution and on surface‐state (orange). Results demonstrate that disulfide bond chain structures allow considerable inhibition distance aromatic skeletons, causing aggregation‐state emission, multiple interactions can reduce non‐radiative processes benefiting AIE. Besides, fast slow fluorescence species be confirmed to correspond paths surface‐state, respectively. The wavelength, photoluminescence quantum yield (PLQY), AIE strength engineered by regulated charge transfer π‐π stacking. This study not only reveals intrinsic mechanism luminescence dynamics but also provides method controlling wavelength enhancing aggregated particles using length.

Language: Английский

Citations

2
An ultrasensitive colorimetric/fluorescent/photothermal sensing platform for the detection of D-amino acids based on carbon dots nanozymes with enhanced peroxidase-like activity DOI Creative Commons
Wei Wu, Ni Chen, Yanli Huang

et al.

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

Published: Jan. 20, 2025

Language: Английский

Citations

0
The Influence of Endogenous Derivatives on the Self-Assembly of Carbonized Polymer Dots DOI Creative Commons

Yingxi Qin,

Wenkai Zhang, Ziwei Liu

et al.

Solids, Journal Year: 2025, Volume and Issue: 6(1), P. 14 - 14

Published: March 20, 2025

Carbonized polymer dots (CPDs) have emerged as a fascinating class of functional nanomaterials with unique physicochemical properties. However, the mechanisms governing their formation and photoluminescence remain subject intense debate. In this study, we conducted systematic comparison structural, morphological, optical properties CPDs synthesized using various methods, revealing self-assembly characteristics low-molecular-weight relatively complex structures. Through comprehensive analyses, found that fewer endogenous derivatives exhibited pronounced concentration-dependent self-assembly, leading to larger particle sizes enhanced fluorescence emission at higher concentrations. contrast, proportions showed limited due supramolecular interactions between chains. Remarkably, removal ternary solvent extraction method significantly CPDs. These findings highlight critical role in modulating photophysical CPDs, paving way for future advancements field.

Language: Английский

Citations

0
Unit-Emitting Carbon Dots DOI
Yunsheng Xia,

Yanli Xu

The Journal of Physical Chemistry Letters, Journal Year: 2024, Volume and Issue: 15(25), P. 6482 - 6488

Published: June 13, 2024

Understanding the photoluminescence mechanisms of carbon dots (C-dots) is importance for both fundamental science and their corresponding applications. In this study, we verify emitting-unit model C-dots by an upgraded "contrastive analysis" research paradigm. Employing preparative thin-layer chromatography, recently developed polyamide column chromatography separation techniques, four kinds highly correlative are obtained from a homologous sample made ortho-aminophenol precursors. Combining comprehensive experimental characterizations, especially direct evidence electrospray ionization mass spectrometry, demonstrate that comes same polycyclic aromatic hydrocarbon units (named as emitting units) indeed, although these have substantially different chemical compositions.

Language: Английский

Citations

1
Polarity-Targeted Carbon Dots for Mitochondria and Lysosomes Imaging DOI

Mengzhe Zhao,

Meng-Han Lin,

Ge Guo

et al.

Analytical Chemistry, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 14, 2024

Normally, electrostatic-dependent mitochondria localization can cause a decrease/loss of mitochondrial membrane potential (MMP), leading to the corresponding abnormal behaviors. So, achieving subcellular organelle and imaging with as little interference on their physiological activity is significance for understanding cell activity. Herein, we discover demonstrate that "polarity" independently act novel kind target labeling at level. On this basis, lysosomes are precisely fluorescently imaged by two kinds polarity-targeted carbon dots (C-dots), respectively. The C-dots, named C-dots-1 C-dots-2, have almost identical size morphology well surface chemistry. subtle difference polarity property: both them amphiphilic, 1.54 0.95 log P values. Different from commonly used cationic-based probes, C-dots possess slightly negatively charged surfaces (ζ-potential values ∼ -2.5 -7.5 mV) conditions. Interestingly, C-dots-2 capacity highly selectively lysosomes, whether cancer cells or normal cells. Because targeting processes do not rely electrostatic attraction effects, MMP changed during processes. behaviors caused diminishing, example, autophagy phenomenon, be effectively avoided.

Language: Английский

Citations

1
Multi-color emission composites of white carbon dots and dyes through inner filter effect DOI
Hong Ren, Jinbao Wang,

Shihua Yu

et al.

Materials Today Communications, Journal Year: 2024, Volume and Issue: 41, P. 110428 - 110428

Published: Sept. 16, 2024

Language: Английский

Citations

0
Decisive role of organic fluorophore and surface defect state in the photoluminescence of carbon quantum dots DOI

Chao Jiang,

Xifang Chen,

Xiaowen Zhang

et al.

Applied Physics Letters, Journal Year: 2024, Volume and Issue: 125(22)

Published: Nov. 25, 2024

Carbon quantum dots (CQDs) hold significant promise for applications in biological imaging, sensing, and optoelectronic devices owing to their superior photostability low toxicity. Nevertheless, the elucidation of photoluminescence mechanism remains an open question, necessitating further comprehensive investigation. In this Letter, CQDs exhibiting ultraviolet (UV) white fluorescence were isolated through silica gel column chromatography separation crude product obtained from a one-step solvothermal synthesis. with different luminescent properties exhibit same crystal structure similar particle size distributions. Both orthorhombic where C60/C70 molecules are located at lattice points, having average sizes 2.71 2.98 nm, respectively. Consequently, synthesized predominantly governed by surface structure. The results microstructure characterization spectroscopic analysis demonstrate that UV emission originates C(=O)OH C–O–C related moieties within organic fluorophores, blue band is attributed defect states group C–O–C, while green/yellow arises C(=O)O levels. These observations have gained profound understanding genesis CQDs, broadened luminescence coverage wavelength range enriched family materials.

Language: Английский

Citations

0