Solvent-controlled synthesis of multicolor photoluminescent carbon dots for bioimaging

Yang, Yan; Xia, Longyu; Ma, Lan

doi:10.1039/c9ra04241e

Cited by 29 publications

(18 citation statements)

References 57 publications

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“…22−25 For example, Yan et al have detailed the citric acid-based red, green, and blue emissive CDs in formic acid, ethanol, and HCl, respectively. 21 Chao et al have shown the multicolor emission by dispersing the o-phenylenediamine-based CDs in ethylene glycol, tetrahydrofuran, methanol, acetone, and N,N-dimethylformamide. 25 Recently, some researchers have provided the mechanism for solvatochromism.…”

Section: ■ Introductionmentioning

confidence: 99%

“…To date, few researchers have developed multicolor wavelength emissive CDs using different solvents. , In general, there are two ways that have conveyed to tune the solvent-dependent fluorescence property of carbon dots. These are either carbon dots that are directly synthesized using different solvents from the same precursor − or may be synthesized CDs dispersed in different solvents to observe the tunable property. − For example, Yan et al have detailed the citric acid-based red, green, and blue emissive CDs in formic acid, ethanol, and HCl, respectively . Chao et al have shown the multicolor emission by dispersing the o -phenylenediamine-based CDs in ethylene glycol, tetrahydrofuran, methanol, acetone, and N , N -dimethylformamide .…”

Section: Introductionmentioning

confidence: 99%

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Effect of Solvent-Derived Highly Luminescent Multicolor Carbon Dots for White-Light-Emitting Diodes and Water Detection

Kumari

Sahu

2020

Langmuir

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Recently, the multicolor fluorescent carbon dots (CDs) have drawn much attention due to their various applications. Herein, we report multicolor emissive CDs by solvent-controlled and solvent-responded approaches. The blue to red color emissive CDs are obtained by the solvothermal method by varying the solvent during the reaction. The red color emissive CDs (R-CDs) with good quantum yield is obtained in a water medium. The detailed characterization revealed that the solvent controls the particle size, band gap, and nitrogen doping concentration. Specifically, in the protic solvent, the high N content and presence of imine nitrogen are the reason for red emission. However, in an aprotic solvent, the least N doping and a lack of C–O groups are responsible for a blueshift. Interestingly, it was observed that the R-CDs provide a full range of visible color by dispersing in different immiscible solvents. The fluorescence emission in immiscible solvents is redshifted by enhancing the polarity. Moreover, the developed CDs detected the low water concentrations (≤0.2%, v/v) visually and fluorometrically in various organic solvents. Simultaneously, we have employed synthesized CDs in white-light-emitting diodes and fluorescent ink.

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Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Solvent-Derived Highly Luminescent Multicolor Carbon Dots for White-Light-Emitting Diodes and Water Detection

Kumari

Sahu

2020

Langmuir

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“…Due to the abundant polar function groups, these simples have good solubility in solvents of polarity, such as water and ethanol (EtOH). [41,42] The peaks at 1530 and 1629 cm −1 can be observed for each sample. These peaks are a result of the stretching vibration in the CC group, which can be considered as the formation of aromatic ring skeleton during synthesis.…”

Section: Resultsmentioning

confidence: 99%

Ionic Liquid‐Assisted Fast Synthesis of Carbon Dots with Strong Fluorescence and Their Tunable Multicolor Emission

Cao

Zhao

Gong

2022

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Conventional synthesis of carbon dots (CDs) mostly involves a hydrothermal or solvent‐thermal reaction which needs relatively high temperature and pressure. In this work, ionic liquid is used to assist in fast synthesizing CDs with an ultrahigh photoluminescent quantum yield (98.5%) by heating at a low temperature (≤100 °C) and at atmospheric pressure. In addition, through this approach, tunable multicolor emissive CDs can be successfully achieved and used for preparing high‐performance white light‐emitting diodes. Theoretical computation proves that the activity of synthesis reaction can be significantly enhanced by ionic liquids. Density functional theory calculation reveals that the size and graphite nitrogen ratios of CDs have an effect on bandgap reduction, resulting in a redshift of the emission, which is in good agreement with the experimental results. This simple and promising approach for fast synthesis of tunable emissive CDs using ionic liquid affords the facilitation of CDs‐based luminescent materials for fast manufacturing of functional devices.

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“…9 Currently, increasing research interests of GQDs are focused on multichannel detection by taking advantages of their multicolor emissions, especially in a long wavelength range. 10 For example, Qin et al synthesized polychromatic GQDs from blue to red bands by changing the content of the precursor and the reaction temperature for the application of ion sensing and solid lighting. 11 Zheng et al prepared composite red, green, and blue GQDs by changing the reaction solvent and applying them in LED fields.…”

Section: Introductionmentioning

confidence: 99%

“…Ascribed to their outstanding photoluminescence properties, high stabilities, exceptional biocompatibilities, and inexpensive precursors, , in recent years, great efforts have been made to further develop GQD materials for latent applications such as fluorescence sensing, light-emitting diodes (LEDs), photocatalysis, bioimaging, and drug delivery . Currently, increasing research interests of GQDs are focused on multichannel detection by taking advantages of their multicolor emissions, especially in a long wavelength range . For example, Qin et al synthesized polychromatic GQDs from blue to red bands by changing the content of the precursor and the reaction temperature for the application of ion sensing and solid lighting .…”

Section: Introductionmentioning

confidence: 99%

Multicolor Graphene Quantum Dots via Solvatochromic Tuning and Sulfur Doping for Light-Emitting Diodes

Yang

Wang

Tang

et al. 2021

ACS Appl. Nano Mater.

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Recently, graphene quantum dots (GQDs) with polychrome emission capability have attracted much attention due to their multifarious applications. In this study, we report a facile and green approach for rapid preparation of multicolor emission GQDs. Experimentally, UV light was used to drive the lowtemperature synthesis, and a tunable emission wavelength of the GQDs was achieved through the synergistic effect of solvatochromic tuning and sulfur doping. Results show that multicolor emission wavelengths of green-GQDs (G-GQDs) from blue to yellow are obtained by simply controlling the polarity of the surrounding solutions. Moreover, red-GQDs with the emission wavelengths extended from green to red are further obtained by sulfur doping. Thereafter, G-GQDs were used to develop a trace water-detecting platform, ascribed to the high sensitivity of water-quenchable fluorescence, and a low detection limit of 0.061% was achieved. Meanwhile, based on the outstanding multicolor tunability of as-prepared GQDs, we successfully manufactured multicolor solid fluorescence films to fabricate multicolor light-emitting diode (LED) devices. Furthermore, high-quality white LEDs (WLEDs) are fabricated with the CIE coordinates of (0.341, 0.354) and a color temperature of 5161 K. This study highlights the potential of GQDs in various applications, including solid-state fluorescence films, optoelectronics, and optical molecular sensing.

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Solvent-controlled synthesis of multicolor photoluminescent carbon dots for bioimaging

Abstract: The synthesis and bioimaging of multicolor carbon dots from citric acid and urea.

Cited by 29 publications

References 57 publications

Effect of Solvent-Derived Highly Luminescent Multicolor Carbon Dots for White-Light-Emitting Diodes and Water Detection

Effect of Solvent-Derived Highly Luminescent Multicolor Carbon Dots for White-Light-Emitting Diodes and Water Detection

Ionic Liquid‐Assisted Fast Synthesis of Carbon Dots with Strong Fluorescence and Their Tunable Multicolor Emission

Multicolor Graphene Quantum Dots via Solvatochromic Tuning and Sulfur Doping for Light-Emitting Diodes

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