A pH-controlled synthetic route to violet, green, and orange fluorescent carbon dots for multicolor light-emitting diodes

Dai, Ruoyu; Chen, Xipao; Ouyang, N. Kik S.; Hu, Yaoping

doi:10.1016/j.cej.2021.134172

Cited by 87 publications

(44 citation statements)

References 55 publications

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“…36,37 Under the high temperature and high-pressure environment provided by the hydrothermal treatment, the heavier fragments were further polymerized, cross-linked, and carbonized to form the final W-CDs with less polymeric features. 20 To our excitement, multicolor CDs could also be facilely prepared with the same synthesis system by micro-adjusting the reaction parameters (Figure 1, b2−b4). As can be seen, when the identical reaction was treated only with microwave irradiation (MI), yellow-emitting CDs (Y-CDs) could be successfully obtained (Figure 1, b2), the Y-CDs demonstrated obvious emission peaks at 588 nm when excited by light of 360−440 nm, which were well within the wavelength range of yellow light (597−577 nm) (Figure 1, c1).…”

Section: Assembly Of Y- R- G- and W-leds With Ergmentioning

confidence: 99%

“…The observations of clear lattice fringes in the TEM and strong absorption (350−600 nm) in the UV−vis spectrum of W-CDs collectively supported the polymerization and carbonization of 2,3-diaminopyridine during the synthesis of W-CDs. 20 To elucidate their structural features, the W-CDs were further characterized with XRD and Raman spectroscopy. As demonstrated (Figure 2c), the XRD pattern exhibits a broad diffraction peak at 26.6°, which could be attributed to the (002) plane of graphene.…”

Section: Characterizations Of W-cdsmentioning

confidence: 99%

“…As such, two main strategies have been proposed to conquer these challenges: (1) the synthesis of multicolor CDs within a single reaction system with similar reaction parameters and carbon precursors. − In such a synthesis approach, the preparation of multicolor CDs could be greatly simplified, which should be beneficial for their eventual commercialization; most importantly, multicolor CDs synthesized in such a manner generally have similar chemical properties and stabilities, thus warranting the stability and performance of WLEDs constructed − (group 1, Table S1). (2) The direct preparation of single-component white light-emitting CDs (W-CDs) as white phosphors − not only further reduces manufacturing costs and potential environmental impact but also limits the shortcomings (i.e., color drift, low CRI, etc.…”

Section: Introductionmentioning

confidence: 99%

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Multicolor and Single-Component White Light-Emitting Carbon Dots from a Single Precursor for Light-Emitting Diodes

Han

et al. 2022

ACS Appl. Nano Mater.

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The preparation of multicolor and white light-emitting carbon dots (CDs) is of both significant importance and challenging for their applications as white phosphors for light-emitting diodes (LEDs). In this report, a facile reaction system that is capable of preparing both multicolor and white light-emitting CDs was disclosed. In this system, three CDs emitting yellow, red, and green lights were prepared, and monochromatic LEDs were constructed using these multicolor CDs. Most importantly, single-component white light-emitting CDs with CIE coordinates of (0.33, 0.33) were also prepared. The white light-emitting CDs were applied as single-component white phosphors for the fabrication of white LEDs. The white LEDs constructed demonstrated excellent performance, emitting warm white light (CCT = 3723 K) with CIE coordinates of (0.39, 0.37) and an extremely high color-rendering index of 91.5, which should find favorable applications for indoor illumination.

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Section: Assembly Of Y- R- G- and W-leds With Ergmentioning

confidence: 99%

Section: Characterizations Of W-cdsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Multicolor and Single-Component White Light-Emitting Carbon Dots from a Single Precursor for Light-Emitting Diodes

Han

et al. 2022

ACS Appl. Nano Mater.

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“…As shown in Figure 1C , the CDs nanozyme mainly consist of C (284.6 eV, at.% = 78.96), O (530.5 eV, at.% = 17.71), and N (398.5 eV, at.% = 3.33) elements. In Figure 1D , the high-resolution C 1s spectrum reveals three peaks at 284.2, 285.1, 285.7, and 287.6 eV assigned to C−C/C=C, C−N, C−O, and C=O/C=N, respectively ( Dai et al, 2022 ). The HR XPS O 1s spectrum has two peaks, which are attributed to C=O (530.5 eV) and C−O (531.3 eV) bonds, respectively ( Figure 1E ) ( Chen et al, 2021 ).…”

Section: Resultsmentioning

confidence: 99%

Carbon dots nanozyme for anti-inflammatory therapy via scavenging intracellular reactive oxygen species

Dong

Huang

et al. 2022

Front. Bioeng. Biotechnol.

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Developing an efficient antioxidant for anti-inflammatory therapy via scavenging reactive oxygen species (ROS) remains a great challenge owing to the insufficient activity and stability of traditional antioxidants. Herein, we explored and simply synthesized a biocompatible carbon dots (CDs) nanozyme with excellent scavenging activity of ROS for anti-inflammatory therapy. As expected, CDs nanozyme effectively eliminate many kinds of free radicals including •OH, O2•−, and ABTS+•. Benefiting from multienzyme activities against ROS, CDs nanozyme can decrease the levels of pro-inflammatory cytokines, resulting in good anti-inflammatory effect. Taken together, this study not only sheds light on design of bioactive antioxidants but also broadens the biomedical application of CDs in the treatment of inflammation.

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“…According to the HR-TEM images, the four NB-CDs have the same lattice fringe with a fringe spacing of 0.34 nm [ 20 , 21 ]. The Raman spectra of the four NB-CDs ( Figure 3 a) display a crystalline D band at 1356 cm −1 and a disordered G band at 1572 cm −1 , representing the disordered and graphite carbon [ 22 , 23 ]. The intensity ratios (I D /I G ) of the four NB-CDs [ 24 , 25 ] are 2.46, 1.68, 1.26 and 2.07, respectively.…”

Section: Resultsmentioning

confidence: 99%

Facile Synthesis of Multi-Emission Nitrogen/Boron Co-Doped Carbon Dots from Lignin for Anti-Counterfeiting Printing

Zhu

2022

Polymers

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The transformation of lignin with natural aromatic structure into value-added carbon dots (CDs) achieves a win-win situation for low-cost production of novel nanomaterials and reasonable disposal of biomass waste. However, it remains challenging to produce multi-emission CDs from biomass for advanced applications. Herein, a green and facile approach to preparing multi-emission CDs from alkali lignin via N and B co-doping is developed. The obtained N and B co-doped CDs (NB-CDs) show multi-emission fluorescence centers at 346, 428 and 514 nm under different excitations. As the doping amount of N and B increases, the fluorescence emission band gradually shifts to 428 and 514 nm, while that at 346 nm decreases. The fluorescence mechanism is explored through the research of the structure, composition and optical performance of NB-CDs in combination with density functional theory (DFT) calculations. It demonstrates that the effect of doping with B-containing functional groups on the fluorescence emission behavior is multivariate, which may be the crucial contribution to the unique multi-emission fluorescence of CDs. The multi-emission NB-CDs with prominent stability are applied for multilevel anti-counterfeiting printing. It provides a promising direction for the sustainable and advanced application of biomass-derived CDs, and the theoretical results highlight a new insight into the deep understanding of the multi-emission fluorescence mechanism.

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A pH-controlled synthetic route to violet, green, and orange fluorescent carbon dots for multicolor light-emitting diodes

Cited by 87 publications

References 55 publications

Multicolor and Single-Component White Light-Emitting Carbon Dots from a Single Precursor for Light-Emitting Diodes

Multicolor and Single-Component White Light-Emitting Carbon Dots from a Single Precursor for Light-Emitting Diodes

Carbon dots nanozyme for anti-inflammatory therapy via scavenging intracellular reactive oxygen species

Facile Synthesis of Multi-Emission Nitrogen/Boron Co-Doped Carbon Dots from Lignin for Anti-Counterfeiting Printing

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