Solid-state N,P-doped carbon dots conquer aggregation-caused fluorescence quenching and couple with europium metal-organic frameworks toward white light-emitting diodes

Han, Sujie; Chen, Xipao; Hu, Yaoping; Han, Lei

doi:10.1016/j.dyepig.2020.109090

Cited by 33 publications

(16 citation statements)

References 41 publications

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“…Further, CQDs have been embedded in a physical gel system, and the self-assembly process has been shown to uniquely enhance the emission intensity. Such solid-state emission behavior of carbon dots and incorporation in gel systems have not been frequently reported in the literature. ,, …”

Section: Introductionmentioning

confidence: 88%

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Multicolor Nitrogen-Doped Carbon Quantum Dots for Environment-Dependent Emission Tuning

et al. 2022

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Carbon quantum dots (CQDs) have potential applications in many fields such as light-emitting devices, photocatalysis, and bioimaging due to their unique photoluminescence (PL) properties and environmental benignness. Here, we report the synthesis of nitrogen-doped carbon quantum dots (NCQDs) from citric acid and m -phenylenediamine using a one-pot hydrothermal approach. The environment-dependent emission changes of NCQDs were extensively investigated in various solvents, in the solid state, and in physically assembled PMMA–PnBA–PMMA copolymer gels in 2-ethyl-hexanol. NCQDs display bright emissions in various solvents as well as in the solid state. These NCQDs exhibit multicolor PL emission across the visible region upon changing the environment (solutions and polymer matrices). NCQDs also exhibit excitation-dependent PL and solvatochromism, which have not been frequently investigated in CQDs. Most CQDs are nonemissive in the aggregated or solid state due to the aggregation-caused quenching (ACQ) effect, limiting their solid-state applications. However, NCQDs synthesized here display a strong solid-state emission centered at 568 nm attributed to the presence of surface functional groups that restrict the π–π interaction between the NCQDs and assist in overcoming the ACQ effect in the solid state. NCQD-containing gels display significant fluorescence enhancement in comparison to the NCQDs in 2-ethyl hexanol, likely because of the interaction between the polar PMMA blocks and NCQDs. The application of NCQDs-Gel as a solid/gel state fluorescent display has been presented. This research facilitates the development of large-scale, low-cost multicolor phosphor for the fabrication of optoelectronic devices, sensing, and bioimaging applications.

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Section: Introductionmentioning

confidence: 88%

“…Such solid-state emission behavior of carbon dots and incorporation in gel systems have not been frequently reported in the literature. 19 , 34 , 35 …”

Section: Introductionmentioning

confidence: 99%

Multicolor Nitrogen-Doped Carbon Quantum Dots for Environment-Dependent Emission Tuning

et al. 2022

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“…[60][61][62] The P 2p peaks at 133.8 and 134.8 eV (Fig. 2f) indicated that P mainly existed in the form of P-O (69.37%) and P-C/P]O (30.63%) bonds, 63 which conrmed the successful doping of phosphorus in the carbon dots. The results from the XPS data were in good accordance with those of the FT-IR analysis.…”

Section: Characterization Of R-cdsmentioning

confidence: 99%

One-step microwave synthesis of red-emissive carbon dots for cell imaging in extreme acidity and light emitting diodes

et al. 2022

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“…by introducing specific recognition groups while significantly improving their optical properties and biocompatibility. [15,16] Surface modification has emerged as a powerful strategy for optimizing the performance of CDs and regulating the surface state.…”

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Cyclodextrin Functionalized Carbon Dots Using IFE and FRET Dual Mechanism for Sequential Detection of Morin and Al³⁺

Zang

Yan

et al. 2021

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by introducing specific recognition groups while significantly improving their optical properties and biocompatibility. [15,16] Surface modification has emerged as a powerful strategy for optimizing the performance of CDs and regulating the surface state.Morin as a polyhydroxy flavonoid is widely found in daily foods and thus is ingested to supplement the body. It exerts a variety of beneficial effects in the body, including scavenging free radicals, fighting inflammation, and protecting nerves, and even has a blocking effect on the growth and proliferation of cancer cells. It is commonly used in clinical practice to treat stomach diseases, chronic inflammatory diseases, coronary heart diseases and cancer. [17][18][19][20] However, studies have shown that high doses of morin can lead to pro-oxidative effects on cells, affecting the absorption of substances, drug metabolism and even DNA damage. On the other hand, heavy metal Al 3+ is an important component often used in food packaging, paper, and pharmaceutical industries. [21][22][23][24] According to the World Health Organization study, the tolerable intake of Al 3+ in the human body is estimated to be less than 4 mg per day. [25] The long-term accumulation of excessive Al 3+ can lead to kidney failure and pose a serious threat to the bones, brain and nervous system. In view of the above, a series of analytical methods have been established for the detection of morin and Al 3+ , including high performance liquid chromatography, electrochemical analysis and gas chromatography. [26,27] The above methods have limitations such as complicated pre-treatment, expensive and difficult operation, while the fluorescence method can overcome the defects of existing methods and establish a simple, rapid and reliable detection method with far-reaching practical application prospects.Based on the above, novel cyan Z-CDs were synthesized by surface modification of CDs through amidation reaction using β-CD (Scheme 1). In particularly, β-CD increased the spatial site resistance between CDs, which effectively suppressed the aggregation quenching effect and improved the luminescence intensity, and this results in excellent dispersion, stability and superior fluorescence properties of Z-CDs. Furthermore, the addition of morin could effectively quenched the fluorescence of Z-CDs and Al 3+ could make rapid recovery of the fluorescence of the Z-CDs-morin. The spectral characterization and Carbon dots (CDs) are emerging photoluminescent materials with excellent optical properties. However, the lack of active sites in primitive CDs has limited their development applications. Herein, functionalized carbon dots (Z-CDs) are successfully prepared by surface modification of CDs with mono (6-amino-6-deoxy) cyclodextrin (β-CD). The introduction of β-CD increases the spatial potential resistance between CDs, which effectively reduces the self-quenching effect. Moreover, the conjugated domains of Z-CDs are expanded, which improves the optical properties with a quantum yield of 48.74%. Z-CDs are ab...

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Solid-state N,P-doped carbon dots conquer aggregation-caused fluorescence quenching and couple with europium metal-organic frameworks toward white light-emitting diodes

Cited by 33 publications

References 41 publications

Multicolor Nitrogen-Doped Carbon Quantum Dots for Environment-Dependent Emission Tuning

Multicolor Nitrogen-Doped Carbon Quantum Dots for Environment-Dependent Emission Tuning

One-step microwave synthesis of red-emissive carbon dots for cell imaging in extreme acidity and light emitting diodes

Cyclodextrin Functionalized Carbon Dots Using IFE and FRET Dual Mechanism for Sequential Detection of Morin and Al³⁺

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Solid-state N,P-doped carbon dots conquer aggregation-caused fluorescence quenching and couple with europium metal-organic frameworks toward white light-emitting diodes

Cited by 33 publications

References 41 publications

Multicolor Nitrogen-Doped Carbon Quantum Dots for Environment-Dependent Emission Tuning

Multicolor Nitrogen-Doped Carbon Quantum Dots for Environment-Dependent Emission Tuning

One-step microwave synthesis of red-emissive carbon dots for cell imaging in extreme acidity and light emitting diodes

Cyclodextrin Functionalized Carbon Dots Using IFE and FRET Dual Mechanism for Sequential Detection of Morin and Al3+

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Cyclodextrin Functionalized Carbon Dots Using IFE and FRET Dual Mechanism for Sequential Detection of Morin and Al³⁺