Multi-color carbon dots for white light-emitting diodes

Su, Run; Guan, Qingwen; Cai, Wei; Yang, Wenjing; Xu, Quan; Guo, Yongjian; Zhang, Lipeng; Ling, Fei; Meng, Xu

doi:10.1039/c8ra09868a

Cited by 25 publications

(18 citation statements)

References 40 publications

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“…Several studies have shown that under similar synthetic conditions, the molecular structure of isomers [ 15 , 50 , 51 , 52 ] and the molar ratio of precursors [ 51 , 53 , 54 ] have a significant effect on the optical properties of the resulting CDs. In [ 55 ], the role of doping heteroatoms was demonstrated: nitrogen- and sulfur-doping resulted in the appearance of additional energy levels, which shifted the emission band of CDs towards longer wavelength.…”

Section: Improvements Of Optical Properties Of Cdsmentioning

confidence: 99%

“…In [ 55 ], the role of doping heteroatoms was demonstrated: nitrogen- and sulfur-doping resulted in the appearance of additional energy levels, which shifted the emission band of CDs towards longer wavelength. CDs can be doped by metal ions during the synthesis: by adjusting the molar ratio of p-phenylenediamine to ZnCl 2 , the CD emission was tuned from 390 to 610 nm with PL QY of 19% [ 54 ]. Theoretical simulations showed that the Zn doping could lead either to red or to blue PL shifts, depending on the functional groups on the CD surface.…”

Section: Improvements Of Optical Properties Of Cdsmentioning

confidence: 99%

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Applications of Carbon Dots in Optoelectronics

et al. 2021

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Carbon dots (CDs) are an attractive class of nanomaterials due to the ease of their synthesis, biocompatibility, and superior optical properties. The electronic structure of CDs and hence their optical transitions can be controlled and tuned over a wide spectral range via the choice of precursors, adjustment of the synthetic conditions, and post-synthetic treatment. We summarize recent progress in the synthesis of CDs emitting in different colors in terms of morphology and optical properties of the resulting nanoparticles, with a focus on the synthetic approaches allowing to shift their emission to longer wavelengths. We further consider formation of CD-based composite materials, and review approaches used to prevent aggregation and self-quenching of their emission. We then provide examples of applications of CDs in optoelectronic devices, such as solar cells and light-emitting diodes (LEDs) with a focus on white LEDs.

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Section: Improvements Of Optical Properties Of Cdsmentioning

confidence: 99%

Section: Improvements Of Optical Properties Of Cdsmentioning

confidence: 99%

Applications of Carbon Dots in Optoelectronics

et al. 2021

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“…Carbon dots (CDs) are recognized as easily prepared, highly tunable photoluminescent, high photo‐stability and excellent bio‐compatible carbon‐based nanomaterials when compared with semi‐conductor quantum dots for various bio‐applications such as optical illumination, bioimaging and biosensing . However, most published reports have focused on CDs that emit blue or green light, and limiting their scope for further bio‐applications.…”

Section: Introductionmentioning

confidence: 99%

Dramatic red fluorescence enhancement and emission red shift of carbon dots following Zn/ZnO decoration

Zuo

Wang

et al. 2019

Luminescence

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Metal atom doping, an easy and convenient method, can optimize and tune the physical-chemical properties and photometrics of carbon dots (CDs). However, there are few reports on the preparation of metal-decorated CDs that give red emission and a high photoluminescence quantum yield (PLQY). Here, we demonstrate a zinc (existing in human body) ion-doping strategy to observably enhance the PLQY and lengthen the CD emission wavelength. The prepared Zn/ZnO-decorated CDs (Zn-CDs) produced red fluorescence (623 nm) with a superior PLQY of 40.3%. Through a series of analyses, Zn-CDs were confirmed to contain an oxidation state and reduction state of Zn doping into the internal defects and surface of Zn-CDs. More valuably, the Zn-CDs had excellent chemical stability, photo-stability, long-term storage stability, and high biocompatibility, and therefore could be used as a robust red fluorescence probe for high-quality cellular imaging. KEYWORDScell imaging, high photoluminescence quantum yield, red emission, zinc-decorated carbon dots

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“…Su et al studied Zn-doped CNDs produced with a one-step solvothermal method and capable of emitting in a large spectral range, useful for potential white LED applications. TEM and AFM characterization techniques both indicate the presence of a regular graphitic core structure with an estimated size of ∼4–5 nm.…”

Section: Computational Studies Of Cndsmentioning

confidence: 85%

Carbon Nanodots from an In Silico Perspective

et al. 2022

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Carbon nanodots (CNDs) are the latest and most shining rising stars among photoluminescent (PL) nanomaterials. These carbon-based surface-passivated nanostructures compete with other related PL materials, including traditional semiconductor quantum dots and organic dyes, with a long list of benefits and emerging applications. Advantages of CNDs include tunable inherent optical properties and high photostability, rich possibilities for surface functionalization and doping, dispersibility, low toxicity, and viable synthesis (top-down and bottom-up) from organic materials. CNDs can be applied to biomedicine including imaging and sensing, drug-delivery, photodynamic therapy, photocatalysis but also to energy harvesting in solar cells and as LEDs. More applications are reported continuously, making this already a research field of its own. Understanding of the properties of CNDs requires one to go to the levels of electrons, atoms, molecules, and nanostructures at different scales using modern molecular modeling and to correlate it tightly with experiments. This review highlights different in silico techniques and studies, from quantum chemistry to the mesoscale, with particular reference to carbon nanodots, carbonaceous nanoparticles whose structural and photophysical properties are not fully elucidated. The role of experimental investigation is also presented. Hereby, we hope to encourage the reader to investigate CNDs and to apply virtual chemistry to obtain further insights needed to customize these amazing systems for novel prospective applications.

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Multi-color carbon dots for white light-emitting diodes

Abstract: Single metal-doped CDs with color-tunable properties have been successful synthesized by regulating the precursor molar ratios.

Cited by 25 publications

References 40 publications

Applications of Carbon Dots in Optoelectronics

Applications of Carbon Dots in Optoelectronics

Dramatic red fluorescence enhancement and emission red shift of carbon dots following Zn/ZnO decoration

Carbon Nanodots from an In Silico Perspective

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