Carbon‐Dot‐Based White‐Light‐Emitting Diodes with Adjustable Correlated Color Temperature Guided by Machine Learning

Wang, Xiao; Wang, Bo; Wang, Hongshuai; Zhang, Tianyang; Qi, Huihui; Wu, Zhenyu; Ma, Yurong; Huang, Hui; Shao, Mingwang; Liu, Yang; Li, Youyong; Kang, Zhenhui

doi:10.1002/anie.202103086

Cited by 70 publications

(48 citation statements)

References 45 publications

(18 reference statements)

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“…Subsequently, the optical properties of the synthetic CDs were discussed in detail. As shown in Figure 3a−c, the UV−vis absorption spectra of the F-CDs in ethanol solution present a strong absorption band at around 280 nm, 38 which was ascribed to the π → π* of CC groups. The UV absorption spectra are shown in Figure 2a−c at the same coordinate (Figure S13).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Phosphorescence Tuning of Fluorine, Oxygen-Codoped Carbon Dots by Substrate Engineering

Zhang

Wang

et al. 2021

ACS Sustainable Chem. Eng.

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Exploiting a precise and reproducible phosphorescence tuning strategy is crucial to tailor-design carbon dots (CDs) for premium gradient anticounterfeiting applications. Toward this target, we designed a facile substrate engineering technique to manipulate the phosphorescence of F, O-codoped CDs. Applying phenolic compounds with different numbers of hydroxyl groups as precursors, the contents of the C–O–C groups in CDs are effectively regulated for gaining outstanding phosphorescence performance as well as the introduction of the F-dopant. After excitation using a UV lamp followed by turning it off, the CDs/polyvinyl alcohol matrix can emit bright yellow room-temperature phosphorescence, which may derive from the synergistic effect of C–F and C–O–C in F and O-codoped CDs. After O and F form a bond, many lone pairs of electrons are generated, which is conducive to the excitation of n → π* and promotes the supplementation of triplet excitons. The phosphorescence tuning of CDs is realized by mixing different substrates, which can provide various phosphorescence lifetimes and colors. Discovering the unique properties, F, O-codoped CDs/substrates can be applied in gradient anticounterfeiting applications. This substrate engineering technique, showing unique and reproducibility with high efficiency, may further facilitate the potential applications of CDs.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Phosphorescence Tuning of Fluorine, Oxygen-Codoped Carbon Dots by Substrate Engineering

Zhang

Wang

et al. 2021

ACS Sustainable Chem. Eng.

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“…A fully automated method combining machine learning and highthroughput synthesis/characterization might aid in the discovery of CDs with targeted properties. 166,167 For the moment, the production of carbon dots from biomass precursors could bring variability and confusion, although potentially is significant as a renewable, inexpensive, and green source. 168 Then, further post-functionalization reactions can be applied to the widely adopted CDs, with some of them already explored, but further research is needed to expand on the examples described in the present Review.…”

Section: Perspectivesmentioning

confidence: 99%

A multifunctional chemical toolbox to engineer carbon dots for biomedical and energy applications

et al. 2022

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Photoluminescent carbon nanomaterials, or carbon dots (CDs), are an emerging class of materials that has recently attracted considerable attention for biomedical and energy applications. They are defined by characteristic sizes of <10 nm, a carbon-based core, and the possibility to add various functional groups at their surface for targeted applications. These nanomaterials possess many interesting physicochemical and optical properties, including tuneable light emission, dispersibility and low toxicity. In this Review, we categorize how chemical tools impact the properties of CDs. We look for pre-and post-synthetic approaches for the preparation of CDs and their derivatives or composites. We then showcase examples to correlate structure, composition, and function and use them to discuss the future development for this class of nanomaterials. monomer/polymer as starting materials. Historically, the top-down strategy was first exploited and consisted mainly of electrochemical or chemical oxidation of graphite. 7 While these approaches can yield relatively large quantities of CDs, they usually employ harsh conditions (in terms of voltage applied or chemical oxidant used), long synthetic times, and still need post-synthetic procedures to tune the optoelectronic properties. From the fluorescence perspective, oxidative cutting of carbon sources leads to more structural defects, resulting in less appealing photoluminescence properties.Currently, the bottom-up syntheses are more popular and will be the focus of this Review. In addition to the multitude of molecular precursors available, other benefits include multiple choices of thermal treatments, quicker reaction times, and more uniform properties in the final material. The choice of precursors and synthetic procedures (i.e. pre-synthetic control) affects the physicochemical properties of CDs in terms of size, graphitization degree, surface functional groups, and doping. Nevertheless, the structural features of the precursors can be retained in the nanoparticles, allowing for some degree of predictability. Single-component, to a certain extent, and multi-component reactions enable the use of straightforward doping strategies. These include heteroatoms (examples here include boron, nitrogen, sulfur, selenium, or a combination of them) and metals (such as lanthanides).Besides pre-synthetic control, engineering the surface composition via post-synthetic approaches is a promising way to optimize and expand the utilization of CDs (Fig. 1b). Post-synthetic strategies usually affect the surface functional groups of the CDs since they are generally inefficient in changing properties and chemical composition of the core. Exploiting their surface chemistry also prompted the development of multifunctional CD-based materials (Fig. 1c).There are many excellent sources of information about the intricacies of CDs properties [7][8][9][10][11] and their applications, [12][13][14][15][16] as well as their progress in comparison to traditional inorganic quantum dots. 17 At first, emphas...

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“…Carbon dots (CDs), which have been proven to promote the performance of photocatalysis and electrocatalysis systems, [28][29][30][31] have the ability to enhance light absorption, accelerate the separation of electrons and holes and improve the surface catalysis effect. [32][33][34][35][36] In the previous study by our group, we combined CDs with several materials, such as sulde (SnS 2 / In 2 S 3 /CDs) 37 and phosphide (CoP/CDs). 38 Furthermore, carbon dots can also be formed in situ during the carbonization process of carbon-based materials, thus a simpler and more convenient strategy to design carbon dot-assisted photocatalysts needs to be developed.…”

Section: Introductionmentioning

confidence: 99%

A carbon dot-based metal-free photocatalyst enables O₂ to serve as both a reactant and electron sink for enhancing H₂O₂ photoproduction

et al. 2022

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Carbon‐Dot‐Based White‐Light‐Emitting Diodes with Adjustable Correlated Color Temperature Guided by Machine Learning

Cited by 70 publications

References 45 publications

Phosphorescence Tuning of Fluorine, Oxygen-Codoped Carbon Dots by Substrate Engineering

Phosphorescence Tuning of Fluorine, Oxygen-Codoped Carbon Dots by Substrate Engineering

A multifunctional chemical toolbox to engineer carbon dots for biomedical and energy applications

A carbon dot-based metal-free photocatalyst enables O₂ to serve as both a reactant and electron sink for enhancing H₂O₂ photoproduction

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Carbon‐Dot‐Based White‐Light‐Emitting Diodes with Adjustable Correlated Color Temperature Guided by Machine Learning

Cited by 70 publications

References 45 publications

Phosphorescence Tuning of Fluorine, Oxygen-Codoped Carbon Dots by Substrate Engineering

Phosphorescence Tuning of Fluorine, Oxygen-Codoped Carbon Dots by Substrate Engineering

A multifunctional chemical toolbox to engineer carbon dots for biomedical and energy applications

A carbon dot-based metal-free photocatalyst enables O2 to serve as both a reactant and electron sink for enhancing H2O2 photoproduction

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A carbon dot-based metal-free photocatalyst enables O₂ to serve as both a reactant and electron sink for enhancing H₂O₂ photoproduction