Blue, green, and red full-color ultralong afterglow in nitrogen-doped carbon dots

Lin, Cunjian; Zhuang, Yixi; Li, Wuhui; Zhou, Tianliang; Xie, Rong‐Jun

doi:10.1039/c8nr09672d

Cited by 184 publications

(146 citation statements)

References 54 publications

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“…The two key features for anticounterfeiting applications are 1) the optical properties of the constituting materials, primarily originating from the chemical components used in the ink, and 2) the complexity of the coded patterns . Security inks have been fabricated using inorganic semiconductor nanocrystals, organic dyes, metal nanoclusters and complexes, carbon dots, rare‐earth‐doped complexes, and up‐conversion nanoparticles . It is still challenging to prepare luminescent materials with well‐controlled emission properties.…”

Section: Introductionmentioning

confidence: 99%

Fluorescent Carbon‐ and Oxygen‐Doped Hexagonal Boron Nitride Powders as Printing Ink for Anticounterfeit Applications

Liu

Nattestad

Naficy

et al. 2019

Advanced Optical Materials

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Increasing demands for optical anticounterfeiting technology require the development of versatile luminescent materials with tunable photoluminescence properties. Herein, a number of fluorescent carbon‐ and oxygen‐doped hexagonal boron nitride (denoted as BCNO) phosphors are found to offer a such high‐tech anticounterfeiting solution. These multicolor BCNO powders, developed in a two‐step process with controlled annealing and oxidation, feature rod‐like particle shape, with varied luminescence properties. Studies of the optical properties of BCNO, along with other characterization, provide insight into this underexplored material. Anticounterfeiting applications are demonstrated with printed patterns which are indistinguishable to the naked eye under visible light but become highly discernible under UV irradiation. The fabricated patterns are demonstrated to be both chemically stable in corrosive environments and physically robust in mechanical bending testing. These properties render BCNO as promising and versatile anticounterfeiting material a wide variety of environments.

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Section: Introductionmentioning

confidence: 99%

Fluorescent Carbon‐ and Oxygen‐Doped Hexagonal Boron Nitride Powders as Printing Ink for Anticounterfeit Applications

Liu

Nattestad

Naficy

et al. 2019

Advanced Optical Materials

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“…It may be enlarged the application of CD‐based materials to the fields of sensing, photodynamic therapy, and bioimaging. [ 145 ]…”

Section: Applications Of Multicolor Cdsmentioning

confidence: 99%

Preparation and Biomedical Applications of Multicolor Carbon Dots: Recent Advances and Future Challenges

Huo

Karmaker

Liu

et al. 2020

Part & Part Syst Charact

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as 0D and discrete, quasispherical nanoparticles with the characteristic size of less than 10 nm in shape. In the past few decades, many researchers have been intrigued by overwhelming application of CDs in fields other than solar photovoltaics, [23][24][25] semiconductor photocatalysis, [26] or light-emitting materials, [27][28][29] like in bioimaging, [30][31][32][33] drug delivery/ release, [34][35][36] theranostics, [37] and biosensing/bioassay. [38][39][40] Albeit with biological imaging agents in vitro and in vivo, heavy metals as the essential elements for the core materials of available high-performance semiconductor quantum dots (QDs) exist substantial toxicity, carcinogenic effects, and environmental hazard, even at low levels. [41][42][43][44][45] Historically, boasting the natural virtues of fascinating optical properties (e.g., up/down-conversion and excitation-dependent fluorescence emission, high fluorescence quantum yields (QY), and long fluorescence lifetime), eco-friendliness, high waterdispersible peculiarity, easy surface-functionality, low cost, highly abundant, and inexpensive raw materials, noninvasiveness, low cytotoxicity, and good biocompatibility afford CDs suitable as the elegant alternatives for toxic QDs containing heavy metals. [46][47][48][49] On the other hand, the CDs have excellent photostability against photobleaching and photoblinking as compared with the conventional organic dyes (typically fluorescein and rhodamine B). [50] In particular, multicolor CDs exhibit tunable photoluminescence by exciting the identical CDs, allowing for multimodal biophotosensitizer in biological field without interference from background autofluorescence. In this review, we aim to systematically offer a summary of preparing multicolor CDs and its various biomedical applications, mainly including for bioimaging, drug delivery/release, theranostics, and biosensing/bioassay, highlighting the complete horizons of multiplexed quantitative detection, high-resolution fluorescence imaging, and long-term, real-time monitoring of multicolor CDs.Multicolor carbon dots (CDs) as an emerging subclass of carbonaceous nanomaterials have inspired intensive attention due to the fascinating fluorogenic properties of quantum dots, exhibiting great potential applications in the biomedical field. In some cases, reported CDs with blue or green fluorescence are not desirable for further biological applications owing to the conflicting background autofluorescence, low penetration, and relatively large damage to biological tissue. However, multicolor CDs that can work in the longer wavelength region are being developed to address this issue by overcoming the autofluorescence from the cellular components (usually in the blue and green range). In this review, the development of multicolor CDs is described comprehensively, including for red-emissive or NIR-emissive CDs. Additionally, the preparation methods of multicolor CDs are summarized. Moreover, the factors affecting the luminescence of multicolor CDs are discussed in de...

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“…In general, the pH of healthy skin is slightly acidic with pH value ranging from 5 to 5.5, while wound milieu after infection will become more alkaline with pH value in the region of 7-9, owing to the presence of enzymes and bacteria. [1,2] Over the past years, apart from developing advanced biomaterials for promoting wound healing, [3,4] there are growing evidences to suggest that the determination printing, [20][21][22] and so forth. In their numerous applications, the pH nanosensors based on CDs have aroused tremendous interest in recent years by their merits of simple operation, easy detection, fast response, and high sensitivity.…”

Section: Introductionmentioning

confidence: 99%

Orange‐Emissive Carbon Quantum Dots: Toward Application in Wound pH Monitoring Based on Colorimetric and Fluorescent Changing

Yang

Zhu

Zhang

et al. 2019

Small

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Monitoring of wound pH is critical for interpreting wound status, because early identification of wound infection or nonhealing wounds is conducive to administion of therapies at the right time. Here, novel orange‐emissive carbon quantum dots (O‐CDs) are synthesized via microwave‐assisted heating of 1,2,4‐triaminobenzene and urea aqueous solution. The as‐prepared O‐CDs exhibit distinctive colorimetric response to pH changing, and also display pH‐sensitive fluorescence. Benefiting from the response of O‐CDs over a wound‐relevant pH range (5–9), medical cotton cloth is selected to immobilize O‐CDs through hydrogen bond interactions, the resultant O‐CDs‐coated cloth with emission at 560 nm shows a high response to pH variation in the range of 5–9 via both fluorescence and visible colorimetric changes. Moreover, the sensitivity of fluorescence to pH is capable of establishing an analytical mode for determining pH value. Further, the O‐CDs‐based pH indicator possesses not only superior biocompatibility and drug compatibility but also excellent resistance leachability and high reversibility. Importantly, the usage of O‐CDs‐coated cloth to detect pH is free from the interference of blood contamination and long‐term storage, thus providing a valuable strategy for wound pH monitoring through visual response and quantitative determination.

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Blue, green, and red full-color ultralong afterglow in nitrogen-doped carbon dots

Abstract: A facile synthetic route to realize RGB full-color ultralong afterglow and triple-mode emissions in carbon-dot-based anti-counterfeiting inks was developed herein.

Cited by 184 publications

References 54 publications

Fluorescent Carbon‐ and Oxygen‐Doped Hexagonal Boron Nitride Powders as Printing Ink for Anticounterfeit Applications

Fluorescent Carbon‐ and Oxygen‐Doped Hexagonal Boron Nitride Powders as Printing Ink for Anticounterfeit Applications

Preparation and Biomedical Applications of Multicolor Carbon Dots: Recent Advances and Future Challenges

Orange‐Emissive Carbon Quantum Dots: Toward Application in Wound pH Monitoring Based on Colorimetric and Fluorescent Changing

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