Author
Yawei Wu
Bio: Yawei Wu is an academic researcher from Tianjin Polytechnic University. The author has contributed to research in topics: Carbon. The author has an hindex of 1, co-authored 1 publications receiving 9 citations.
Topics: Carbon
Papers
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TL;DR: In this article, the authors reported that most CDs are self-quenched due to the direct π-π in the π in the carbon dots. But, they have been widely used in various fields due to their outstanding optical properties.
Abstract: Since carbon dots (CDs) were reported in 2004, they have been widely used in various fields due to their outstanding optical properties. However, most CDs are self-quenched due to the direct π–π in...
45 citations
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15 Apr 2017
TL;DR: For the first time, monochrome electroluminescent light-emitting diodes (LEDs) with MCBF-CQDs directly as an active emission layer are fabricated and the maximum luminance of blue LEDs reaches 136 cd m-2, which is the best performance for CQD-based monochrominescent LEDs.
Abstract: Multicolor bandgap fluorescent carbon quantum dots (MCBF-CQDs) from blue to red with quantum yield up to 75% are synthesized using a solvothermal method. For the first time, monochrome electroluminescent light-emitting diodes (LEDs) with MCBF-CQDs directly as an active emission layer are fabricated. The maximum luminance of blue LEDs reaches 136 cd m-2 , which is the best performance for CQD-based monochrome electroluminescent LEDs.
134 citations
TL;DR: In this article , a review comprehensively summarizes the development of synthetic strategies, photoluminescence (PL) mechanisms and promising applications of CDs, and aims to encourage related researchers to overcome various existing technical challenges, make up the insufficiency of existing research and tap into the full potential of CDs.
95 citations
TL;DR: In this paper, a review comprehensively summarizes the development of synthetic strategies, photoluminescence (PL) mechanisms and promising applications of CDs, and the prospects and challenges for research into CDs are discussed in depth.
94 citations
TL;DR: The results show the role of cyano groups in the curvature of carbon quantum ribbons for CQR formation and emission of stable solid-state bandgap fluorescence and facilitates the development of high-performance low-cost REE-free phosphors.
Abstract: The negative impact of rare-earth elements (REEs) on the environment, limited supply and high cost prompt the need for REE-free phosphor-converted white light-emitting diodes (LEDs). Here, we report the gram-scale synthesis of red/green/blue solid-state bandgap fluorescent carbon quantum rings (R/G/B-SBF-CQRs) with high quantum yields up to 30-46 %. This was achieved using cyano-group-bearing p-phenyldiacetonitrile as precursor and forming carbon quantum rings of different diameters through the linkage of curved carbon quantum ribbons of different lengths. The results show the role of cyano groups in inducing the curvature of the carbon quantum ribbons for CQR formation and emission of stable solid-state bandgap fluorescence. R/G/B-SBF-CQRs-phosphor-based LEDs emitted warm white light with low CCT (3576 K), high CRI (96.6), and high luminous efficiency (48.7 lm W-1 ), comparable to REE-phosphor-based LEDs.
57 citations
TL;DR: In this article , the authors present a systematic classification and summary of multiple regulation methods of synthetic multicolor carbon dots (MCDs) and review the recent research progress in the synthesis of MCDs from a variety of precursor materials such as aromatic molecules, small organic molecules, and natural biomass.
Abstract: As a relatively new type of fluorescent carbon-based nanomaterials, multicolor carbon dots (MCDs) have attracted much attention because of their excellent biocompatibility, tunable photoluminescence (PL), high quantum yield, and unique electronic and physicochemical properties. The multicolor emission characteristics of carbon dots (CDs) obviously depend on the carbon source precursor, reaction conditions, and reaction environment, which directly or indirectly determines the multicolor emission characteristics of CDs. Therefore, this review is the first systematic classification and summary of multiple regulation methods of synthetic MCDs and reviews the recent research progress in the synthesis of MCDs from a variety of precursor materials such as aromatic molecules, small organic molecules, and natural biomass, focusing on how different regulation methods produce corresponding MCDs. This review also introduces the innovative applications of MCDs in the fields of biological imaging, light-emitting diodes (LEDs), sensing, and anti-counterfeiting due to their excellent PL properties. It is hoped that by selecting appropriate adjustment methods, this review can inspire and guide the future research on the design of tailored MCDs, and provide corresponding help for the development of multifunctional MCDs.
29 citations