Oxidation-induced quenching mechanism of ultrabright red carbon dots and application in antioxidant RCDs/PVA film

Li, Dongna; Kou, Erfeng; Li, Wei; Zhang, Haoran; Zhang, Xuejie; Zhuang, Jianle; Liu, Yingliang; Hu, Chaofan; Zheng, Yinjian; Yang, Qichang; Lei, Bingfu

doi:10.1016/j.cej.2021.131653

Cited by 53 publications

(28 citation statements)

References 48 publications

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“…[3f,18c] Upon excitation at 520 nm, a vibronic structured red fluorescence is observed for N-CDs in EtOH, where the dual-emission at 600 and 650 nm is an optical feature of o-PD-derived CDs. [19] The vibrational progressional spacing is determined to be 1230 and 1310 cm −1 , in accordance with the vibrational stretching modes of aromatic rings. Furthermore, the optical band gap (E g ) was estimated by Tauc plot (Figure S11, Supporting Information).…”

Section: Resultsmentioning

confidence: 61%

Rational Synthesis of Solid‐State Ultraviolet B Emitting Carbon Dots via Acetic Acid‐Promoted Fractions of sp³ Bonding Strategy

Liang

et al. 2022

Advanced Materials

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Carbon dots (CDs) have received tremendous attention for their excellent photoluminescence (PL) properties. However, it remains a great challenge to obtain CDs with ultraviolet (UV, 200–400 nm) emission in solid state, which requires strict control of the CDs structure and overcoming the aggregation‐caused quenching (ACQ). Herein, a new sp3 compartmentalization strategy is developed to meet these requirements, by employing acetic acid to promote fractions of sp3 bonding during the synthesis of CDs. It markedly decreases the size of sp2 conjugating units in the CDs, and shifts PL emission to the ultraviolet B (UVB) region (λmax = 308 nm). Moreover, sp2 domains are well spatially compartmentalized by sp3 domains and the ACQ effect is minimized, enabling the high quantum yield in solid state (20.2%, λex = 265 nm) with a narrow bandwidth of 24 nm and environmental robustness. The solid‐state UVB emissive CDs are highly desired for application in photonic devices. Hence, a demo of UVB light‐emitting diodes is fabricated for plant lighting, leading to a 29% increase of ascorbic acid content in the basil. Overall, a rational and efficient way to construct solid UVB‐CDs phosphors for wide applications is provided.

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Section: Resultsmentioning

confidence: 61%

Rational Synthesis of Solid‐State Ultraviolet B Emitting Carbon Dots via Acetic Acid‐Promoted Fractions of sp³ Bonding Strategy

Liang

et al. 2022

Advanced Materials

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“…[15] Among the reports on the red fluorescent carbon dots (r-CDs) prepared by the environmentally friendly hydrothermal method, only four papers have QY over 40%, but their monochromaticity is very low (FWHMs > 80 nm, visual inspection) and purification requires the troublesome dialysis or column chromatography. [16][17][18][19] The higher product yield stands for a more economical method and the higher efficiency. But there are only four articles on the preparation of highyield CDs by hydrothermal method with a yield of >35%.…”

mentioning

confidence: 99%

Hydrothermal Synthesis of High‐Yield Red Fluorescent Carbon Dots with Ultra‐Narrow Emission by Controlled O/N Elements

Xian

2022

Advanced Materials

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are less than 30 nm, but only one is prepared by hydrothermal method, and the other reaction systems are organic solvents, as shown in Table S1 (Supporting Information). [6][7][8][9][10][11][12][13][14] However, low fluorescence quantum yield (QY) can limit their applications. For instance, white light emitting diodes only based on luminescent materials with low QY are difficult to realize. [15] Among the reports on the red fluorescent carbon dots (r-CDs) prepared by the environmentally friendly hydrothermal method, only four papers have QY over 40%, but their monochromaticity is very low (FWHMs > 80 nm, visual inspection) and purification requires the troublesome dialysis or column chromatography. [16][17][18][19] The higher product yield stands for a more economical method and the higher efficiency. But there are only four articles on the preparation of highyield CDs by hydrothermal method with a yield of >35%. [20][21][22][23] And three of them are blue emission, one is green emission, no red emission, and their FWHMs are all over 80 nm by visual inspection. There is no report on the preparation of r-CDs that simultaneously takes into account the environmental protection, the fluorescence monochromaticity, QY, and the yield. In this work, the hydrothermal method was used to prepare the r-CDs with double emission peaks (600 nm and 658-683 nm), ultra-narrow FWHMs (20 and 30 nm), and high yield (83.3%).At present, the several main emission mechanisms of CDs have been proposed, such as the quantum confineme effect, the surface state, the molecule state, and the aggregation-induced emission (AIE). [24][25] In this work, the long-wavelength side emission of r-CDs belongs to AIE, and its longest emission wavelength (683 nm) reaches the near infrared region, which benefits from deeper penetration due to the minimum autofluorescence and reduced light scattering, offering a great imaging contrast and spatial resolution. [7] The AIE regularly blue shifts with the decrease of r-CDs concentration and the logarithmic relationship of y = 8.853ln(x) + 688.53 is obtained for the first time, where y is emission wavelength and x is concentration of r-CDs. It may be caused by the regular decrease of r-CDs aggregate size with the decrease of r-CDs concentration in solution. And the presence of the r-CDs aggregates is confirmed by the light scattering phenomenon of different concentrations of r-CDs solution and the X-ray diffraction (XRD) analysis. Red fluorescent carbon dots (r-CDs) with narrow dual emissions (600 nm and 658-683 nm, full width at half-maximums (FWHMs) of 20 nm and 30 nm), fluorescence quantum yield of 41.0%, and yield of 83.3% are prepared by hydrothermal method using o-phenylenediamine as precursor and inorganic oxidant as yield enhancer, and they have graphite nitrate-like structures. The long-wavelength side emission is aggregation-induced emission (AIE). A logarithmic relationship between the AIE wavelength (y) and the concentration (x) (y = 8.853ln(x) + 688.53, R = 0.998) is found. This regularity and the hig...

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“…Compared with the control, the biomass (B,C) and chorophyll content (D) of mung bean sprouts were enhanced by the application of antioxidant red emissive carbon dots RCDs/polyvinyl alcohol (PVA) film. Reproduced with permission: Copyright 2021, Elsevier 60 …”

Section: Effects Of Fluorescent Cds On the Preharvest Process Of Cropsmentioning

confidence: 99%

The role of fluorescent carbon dots in crops: Mechanism and applications

et al. 2022

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Fluorescent carbon dots (CDs) have been widely studied in biosensing, imaging, information encryption, and optoelectronic devices due to excellent optical properties, such as photostability, tunable luminescence range, and resistance to photobleaching. In recent years, CDs have been explored for use in agriculture. Based on their light harvest and light conversion capacity, as well as their characteristics of easy synthesis and low toxicity, CDs show great potential in improving crop photosynthesis.In addition, CDs can also be used for smart and anticounterfeiting packing, food safety detection, and preservation of crops after harvest. In this study, the application of CDs with excellent optical properties in crops has been summarized, including preharvest processes (photosynthesis and plant imaging), and postharvest processes (crop preservation and food safety).Then the toxicity of CDs to crops is introduced. Finally, the present challenges and future prospects are discussed.

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Oxidation-induced quenching mechanism of ultrabright red carbon dots and application in antioxidant RCDs/PVA film

Cited by 53 publications

References 48 publications

Rational Synthesis of Solid‐State Ultraviolet B Emitting Carbon Dots via Acetic Acid‐Promoted Fractions of sp³ Bonding Strategy

Rational Synthesis of Solid‐State Ultraviolet B Emitting Carbon Dots via Acetic Acid‐Promoted Fractions of sp³ Bonding Strategy

Hydrothermal Synthesis of High‐Yield Red Fluorescent Carbon Dots with Ultra‐Narrow Emission by Controlled O/N Elements

The role of fluorescent carbon dots in crops: Mechanism and applications

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Oxidation-induced quenching mechanism of ultrabright red carbon dots and application in antioxidant RCDs/PVA film

Cited by 53 publications

References 48 publications

Rational Synthesis of Solid‐State Ultraviolet B Emitting Carbon Dots via Acetic Acid‐Promoted Fractions of sp3 Bonding Strategy

Rational Synthesis of Solid‐State Ultraviolet B Emitting Carbon Dots via Acetic Acid‐Promoted Fractions of sp3 Bonding Strategy

Hydrothermal Synthesis of High‐Yield Red Fluorescent Carbon Dots with Ultra‐Narrow Emission by Controlled O/N Elements

The role of fluorescent carbon dots in crops: Mechanism and applications

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Rational Synthesis of Solid‐State Ultraviolet B Emitting Carbon Dots via Acetic Acid‐Promoted Fractions of sp³ Bonding Strategy

Rational Synthesis of Solid‐State Ultraviolet B Emitting Carbon Dots via Acetic Acid‐Promoted Fractions of sp³ Bonding Strategy