Preparation of N-doped carbon dots based on starch and their application in white LED

Liu, Xinghua; Zheng, Jingxia; Yang, Yongzhen; Chen, Yongkang; Liu, Xuguang

doi:10.1016/j.optmat.2018.10.057

Cited by 36 publications

(14 citation statements)

References 38 publications

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“…236 More recently, they have started making contributions to the field of electrocatalysis, where a variety of such NCQDs have been employed as elecrocatalysts to conduct HER 277 and ORR. 244 In addition, NCQDs (and their composites) derived from bioresources have recently been studied in relatively nontrivial applications such as in optoelectronic devices, 229 anticounterfeiting tools, 23 logic gates, 241 live cell nucleartargeted imaging, 248 and advanced separation technology, 278 to name a few. These bioderived NCQDs have clearly shown their potential in various applications, which surely can be studied in greater detail, especially with an emphasis on their structure−activity relationships.…”

Section: ■ Characterization and Applications Of Ncqdsmentioning

confidence: 99%

Syntheses of N-Doped Carbon Quantum Dots (NCQDs) from Bioderived Precursors: A Timely Update

Shaik

Sengupta

Varma

et al. 2020

ACS Sustainable Chem. Eng.

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The emergence of carbon quantum dots (CQDs) opens up new opportunities in different branches of science and technology primarily because of their conducive biocompatibility, tunable bandgaps, and unique optoelectronic properties, namely, photoluminescence (PL) and fluorescence. Although CQDs are given precedence in the literature, the large-scale sustainable synthesis and the purification of CQDs as well as the study of their effects on health and environment remain a challenge. Hence, more sustainable approaches are being developed to make this category of materials widely applicable, specifically in the context of replacing toxic metal-based QDs. Among the reported synthetic protocols employed to prepare CQDs while controlling their properties, the incorporation of various dopants, surface functionalities, and defects into CQDs offers great promises. Amongst the possibilities, nitrogen dopants contribute significantly due to their broader precursor scope, natural abundance in sustainable bioderived resources, and relatively straightforward and inexpensive synthetic protocols, leading to assorted combinations of nitrogen (N)-doped carbon quantum dots (NCQDs). Here, a brief survey is presented on the recent developments of strategies deployed for the preparation of bioderived NCQDs, emphasizing the uniqueness of the synthetic methodology, choice of precursors, and purification strategies. In addition, characterization, properties, and applications of the selected NCQDs are highlighted. The present status and challenges are also discussed along with the future directions.

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Section: ■ Characterization and Applications Of Ncqdsmentioning

confidence: 99%

Syntheses of N-Doped Carbon Quantum Dots (NCQDs) from Bioderived Precursors: A Timely Update

Shaik

Sengupta

Varma

et al. 2020

ACS Sustainable Chem. Eng.

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show abstract

“…The fluorescence lifetime of the CN-QDs_10% PVA film consists of short-lived components τ1 and τ3 and a long-lived component τ2, which can be attributed to the intrinsic complexation of the carbon core and the surface-state compound, respectively. The high proportionality coefficient for the second decay indicates that the fluorescence emission of the CN-QD surface state had a primary impact on the fluorescence emission of CN-QDs …”

Section: Results and Discussionmentioning

confidence: 99%

Carbon Nitride Quantum Dot-Embedded Poly(vinyl alcohol) Transparent Thin Films for Greenish-Yellow Light-Emitting Diodes

et al. 2021

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Recently, freestanding polymer thin films encapsulated with nanostructures have attracted the significant attention of the scientific community due to their promising application in portable optoelectronic devices. In this research contribution, we have fabricated a freestanding polymer thin film of poly(vinyl alcohol) (PVA) encapsulated with carbon nitride quantum dots (CN-QDs) using the casting method, for the first time. The PVA polymer matrix provides mechanical support as well as dispersion of the CN-QDs preventing its solid-state quenching. From UV–visible spectra, it is revealed that optical transparency decreases with an increase in the concentration of CN-QDs within the PVA polymeric thin film. Such kind of decrease in optical transparency is one of the crucial factors for the optical concert of a nanomaterial. Interestingly, we have optimized the synthesis protocol to retain 40% transparency of the thin film by incorporating 10 wt % CN-QDs along with PVA without deteriorating its optical behavior. It is observed that when CN-QDs are embedded in the PVA matrix, emission becomes independent of excitation wavelength and is localized in the 510–530 nm region of the spectrum. Thus, the films exhibit excellent greenish-yellow emission when excited at 420 nm with the Commission Internationale de l’èclairage (CIE) coordinates (0.39, 0.46) and a correlated color temperature (CCT) of 4105 K. These excellent optoelectronic properties make them a promising candidate for practical phosphor applications. In a nutshell, this study demonstrates a promising way to exhibit the luminescence potential of freestanding polymer/CN-QD films in CN-QD-based solid-state lighting systems.

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“…While the obtained QY values were relatively low, it is important to note that neither the CNPs are synthesized with the highly fluorescent precursor nor they are doped with any other heteroatom as can be typically seen in the literature. 17 , 28 …”

Section: Results and Discussionmentioning

confidence: 99%

“…Carbon nanoparticles (CNPs) are biocompatible fluorescent materials which offer excellent application potential in sensing, − drug delivery, − bioimaging, − LEDs, − and optoelectronic technologies. , In recent years, CNPs are one of the promising candidates in chemistry research because of their unique properties like multicolor fluorescence, size, surface modification, and biocompatibility. The fluorescence of CNPs lies within their surface defects, which serve as surface energy traps and host the radiative recombination of excitons .…”

Section: Introductionmentioning

confidence: 99%

Green Synthesis of Full-Color Fluorescent Carbon Nanoparticles from Eucalyptus Twigs for Sensing the Synthetic Food Colorant and Bioimaging

et al. 2020

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Full-color fluorescent carbon nanoparticles (CNPs) are produced by a facile and green hydrothermal method followed by the differential washing technique. Eucalyptus twigs are used as a precursor to synthesize multiemissive light blue, blue, green, and red CNPs. Brilliant Blue FCF (BB) is a widely used synthetic food colorant, which is toxic for the human body, when consumed beyond the permitted limit. Herein, we demonstrate light blue CNPs as a sensor for selective and sensitive detection of BB via a fluorescence quenching mechanism with a limit of detection of 200 nM. Temperature-dependent fluorescence and 1 H NMR studies confirmed the mechanism as combined dynamic and static quenching. To demonstrate the practical efficacy of the sensor, BB is effectively detected and estimated in selected food samples procured from the market. Moreover, the biocompatibility of light blue and blue CNPs is examined and confirmed by performing a cytotoxicity assay on MDA-MB-231 cell lines. Subsequently, the cellular imaging study is also carried out to explore the internalization process of the CNPs as a function of concentration. To the best of our knowledge, this is the first time that Eucalyptus twigs, a natural source of high abundance, are used as raw materials and valorized for sensing artificial food color and bioimaging purposes.

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Preparation of N-doped carbon dots based on starch and their application in white LED

Cited by 36 publications

References 38 publications

Syntheses of N-Doped Carbon Quantum Dots (NCQDs) from Bioderived Precursors: A Timely Update

Syntheses of N-Doped Carbon Quantum Dots (NCQDs) from Bioderived Precursors: A Timely Update

Carbon Nitride Quantum Dot-Embedded Poly(vinyl alcohol) Transparent Thin Films for Greenish-Yellow Light-Emitting Diodes

Green Synthesis of Full-Color Fluorescent Carbon Nanoparticles from Eucalyptus Twigs for Sensing the Synthetic Food Colorant and Bioimaging

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