Light emitting diodes based on carbon dots derived from food, beverage, and combustion wastes

Sarswat, Prashant K.; Free, Michael L.

doi:10.1039/c5cp04782j

Cited by 103 publications

(50 citation statements)

References 57 publications

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“…41,42 A potentially more direct use of the polymer/carbon dots composite films is to take advantage of their bright fluorescence emissions for displays, signs, or other luminescence-based devices.…”

Section: Resultsmentioning

confidence: 99%

Enhanced fluorescence properties of carbon dots in polymer films

et al. 2016

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Carbon dots of small carbon nanoparticles surface-functionalized with 2,2′-(ethylenedioxy)bis(ethylamine) (EDA) were synthesized, and the as-synthesized sample was separated on an aqueous gel column to obtain fractions of the EDA-carbon dots with different fluorescence quantum yields. As already discussed in the literature, the variations in fluorescence performance among the fractions were attributed to the different levels and/or effectiveness of the surface functionalization-passivation in the carbon dots. These fractions, as well as carbon nanoparticles without any deliberate surface functionalization, were dispersed into poly(vinyl alcohol) (PVA) for composite films. In the PVA film matrix, the carbon dots and nanoparticles exhibited much enhanced fluorescence emissions in comparison with their corresponding aqueous solutions. The increased fluorescence quantum yields in the films were determined quantitatively by using a specifically designed and constructed film sample holder in the emission spectrometer. The observed fluorescence decays of the EDA-carbon dots in film and in solution were essentially the same, suggesting that the significant enhancement in fluorescence quantum yields from solution to film is static in nature. Mechanistic implications of the results, including a rationalization in terms of the compression effect on the surface passivation layer (similar to a soft corona) in carbon dots when embedded in the more restrictive film environment resulting in more favorable radiative recombinations of the carbon particle surface-trapped electrons and holes, and also potential technological applications of the brightly fluorescent composite films are highlighted and discussed.

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Section: Resultsmentioning

confidence: 99%

Enhanced fluorescence properties of carbon dots in polymer films

et al. 2016

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“…While the top-down approach is based on cutting small sheets via physical or chemical techniques until the demanded particle size is reached which include pyrolysis, microwave-assisted approach hydrothermal method doping with heteroatoms such as nitrogen and phosphor, or metals such as Au improves the electrical conductivity and solubility of CDs 5, 7 . Current trend has been focused on the preparation of CDs from “green” materials as a carbon source, during which milk 7 , juice 8 , eggshell 6 even food waste 9 can be used.…”

Section: Introductionmentioning

confidence: 99%

Novel carbon quantum dots from egg yolk oil and their haemostatic effects

Zhao

Zhang

Liu

et al. 2017

Sci Rep

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In this study, the properties of egg yolk oil (EYO) were investigated. Water extraction, dialysis, and ultrafiltration were used to extract and purify EYO, and microscopy, spectrophotometry, and chromatography were used to identify carbon dots (CDs) present in EYO (EYO CDs). Morphology analyses demonstrated that CDs were almost spherical, with an average size of <10 nm, a lattice spacing of 0.267 nm, and a composition of mainly C, O, and Fe. The solution showed bright blue fluorescence at 365 nm. Tail haemorrhaging and liver haemorrhaging experiments showed that CD-treated mice had significantly shorter bleeding times than did control mice. Coagulation assays suggested that EYO CDs stimulate the intrinsic blood coagulation system and activate the fibrinogen system. Thus, EYO CDs possess the ability to activate haemostasis, which may lead to further investigations of this ingredient of traditional Chinese medicine.

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“…These properties have led to a series of potential applications as in light emitting diodes [2,3], solar cells [4,5], sensing [6], catalysis [7], integration in photovoltaic devices etc. [8] and more importantly to a possible breakthrough in biosensing, bioimaging [9][10][11][12][13] and medical diagnosis [14].…”

Section: Introductionmentioning

confidence: 99%

Successful entrapment of carbon dots within flexible free-standing transparent mesoporous organic-inorganic silica hybrid films for photonic applications

Vassilakopoulou

Georgakilas

Vainos

et al. 2017

Journal of Physics and Chemistry of Solids

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The effective entrapment of Carbon dots (CDs) into a polymer-silica hybrid matrix, formed as free standing transparent flexible films, is presented. CDs of 3 nm mean size with strong photoluminescence are embedded into a silica matrix during the sol-gel procedure, using tetraethylorthosilicate and F127 triblock copolymer as the structure directing agent under acidic conditions. The final hybrid nanostructure forms free standing transparent films that show high flexibility and long term stable CDs luminescence indicating the protective character of the hybrid matrix. It is crucial that the photoluminescence of the hybrid's CDs is not seriously affected after thermal treatment at 550 0 C for 30min. Moreover, the herein reported hybrid is demonstrated to be suitable for the fabrication of advanced photonic structures using soft lithography process due to its low shrinkage and distortion upon drying.

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Light emitting diodes based on carbon dots derived from food, beverage, and combustion wastes

Cited by 103 publications

References 57 publications

Enhanced fluorescence properties of carbon dots in polymer films

Enhanced fluorescence properties of carbon dots in polymer films

Novel carbon quantum dots from egg yolk oil and their haemostatic effects

Successful entrapment of carbon dots within flexible free-standing transparent mesoporous organic-inorganic silica hybrid films for photonic applications

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