Full-colour carbon dots: from energy-efficient synthesis to concentration-dependent photoluminescence properties

Meng, Xiang‐Guo; Chang, Qing; Xue, Chaorui; Yang, Jinlong; Hu, Shengliang

doi:10.1039/c7cc00461c

Cited by 188 publications

(125 citation statements)

References 29 publications

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“…Wang et al prepared thickness‐dependent emissive CDs ionogel that could emit fluorescence within blue to red color range. Meng et al and Shao et al reported concentration‐dependent CDs with tunable PL from blue to red, respectively. However, despite the numerous reports on the multicolor emissions from CDs, there are still few recent works on precisely controlled up/down‐conversion PL from the same type of CDs under one single excitation wavelength.…”

Section: Introductionmentioning

confidence: 99%

Precisely Controlled Up/Down‐Conversion Liquid and Solid State Photoluminescence of Carbon Dots

Ren

Sun

et al. 2018

Advanced Optical Materials

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In this work, an efficient strategy is proposed to obtain single‐type carbon dots with precisely controlled up/down‐conversion photoluminescence under both liquid and solid states. Tunable fluorescence from green to red color can be achieved via either changing the solvents or matrices composition, or adjusting the concentration of carbon dots. In particular, the photoluminescence of the carbon dots can be linearly modulated by adjusting the polarity of the solvent, which is attributed to the surface‐state fluorescence mechanism. That is, the increase of solvent polarity causes the decrease of the highest occupied molecular orbital–lowest unoccupied molecular orbital energy levels, and therefore leads to the bathochromic shift of fluorescent emission. Meanwhile, the as‐prepared carbon dots and their hybrids possess excellent thermal stability. Thus, the obtained carbon dots are employed into different solid matrices as multicolor phosphors to fabricate white light‐emitting diodes that are suitable for indoor lighting. In addition, the realization of precisely controlled photoluminescence from the single‐type carbon dots will have wide applications in luminescent fields.

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Section: Introductionmentioning

confidence: 99%

Precisely Controlled Up/Down‐Conversion Liquid and Solid State Photoluminescence of Carbon Dots

Ren

Sun

et al. 2018

Advanced Optical Materials

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“…The decreased distance between each sub-fluorophore induced the electron distribution of SSFPCDs and thus leads to the contraction of previous band gaps as well as Förster resonance energy transfer (FRET) process. [58,59] Since the fluorescence state of SSFPCDs will be contracted into several narrower continuous band gaps with FRET process, an unusual red fluorescence is achieved. To further confirm this mechanism, the temperaturedependent emissions of both the high concentration solution (16.5 mg mL −1 ) and the SSFPCDs powder were tested and analyzed.…”

mentioning

confidence: 99%

Full‐Color Emission Polymer Carbon Dots with Quench‐Resistant Solid‐State Fluorescence

et al. 2017

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Polymer carbon dots (PCDs) represent a new class of carbon dots (CDs) possessing sub‐fluorophores and unique polymer‐like structures. However, like small molecule dyes and traditional CDs, PCDs often suffer from self‐quenching effect in solid state, limiting their potential applications. Moreover, it is hard to prepare PCDs that have the same chemical structure, exhibiting full‐color emission under one fixed excitation wavelength by only modulating the concentration of the PCDs. Herein, self‐quenching‐resistant solid‐state fluorescent polymer carbon dots (SSFPCDs) are prepared, which exhibit strong red SSF without any other additional solid matrices, while having a large production yield (≈89%) and a considerable quantum yield of 8.50%. When dispersed in water or solid matrices in gradient concentrations, they can exhibit yellow, green, and blue fluorescence, realizing the first SSFPCDs with the same chemical structure emitting in full‐color range by changing the ratio of SSFPCDs to the solid matrices.

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“…For excitation-dependent CDs, the fluorescence emission wavelength can be tuned from 400 to 750 nm with a gradual increase in excitation wavelength [34]. The fluorescence intensity of the CDs can also be influenced by environmental factors such as types of solvents [35], Ph [36], temperature [37], and the concentration of CDs [38]. Interestingly, CDs also exhibit up-conversion fluorescence emission that is highly beneficial for in vivo biological applications [24,33,39,40].…”

Section: Carbon Dotsmentioning

confidence: 99%

Carbon Allotrope-Based Optical Fibers for Environmental and Biological Sensing: A Review

Yap

Chan

Tjin

et al. 2020

Sensors

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Recently, carbon allotropes have received tremendous research interest and paved a new avenue for optical fiber sensing technology. Carbon allotropes exhibit unique sensing properties such as large surface to volume ratios, biocompatibility, and they can serve as molecule enrichers. Meanwhile, optical fibers possess a high degree of surface modification versatility that enables the incorporation of carbon allotropes as the functional coating for a wide range of detection tasks. Moreover, the combination of carbon allotropes and optical fibers also yields high sensitivity and specificity to monitor target molecules in the vicinity of the nanocoating surface. In this review, the development of carbon allotropes-based optical fiber sensors is studied. The first section provides an overview of four different types of carbon allotropes, including carbon nanotubes, carbon dots, graphene, and nanodiamonds. The second section discusses the synthesis approaches used to prepare these carbon allotropes, followed by some deposition techniques to functionalize the surface of the optical fiber, and the associated sensing mechanisms. Numerous applications that have benefitted from carbon allotrope-based optical fiber sensors such as temperature, strain, volatile organic compounds and biosensing applications are reviewed and summarized. Finally, a concluding section highlighting the technological deficiencies, challenges, and suggestions to overcome them is presented.2 of 43 of target molecules or physical parameters. In some instances, surface-modified carbon allotropes also permit multi-parameter detection capabilities of carbon allotrope-based OFS [7]. As such, an insight into the recent advances of carbon allotrope-based OFS can serve as a guideline to develop an effective detection approach for emerging real-world applications. Many review articles on carbon allotrope-based OFS mainly focus on a single type of carbon allotrope and the fundamental theory of carbon allotrope-based OFS [8,9]. Thus, this comprehensive review article encompasses the properties, preparation, sensing mechanisms, nanocoating deposition techniques, physical and biochemical sensing applications. This review aims to highlight the recent research work on carbon allotrope-based OFS that will serve as a reference guide for researchers to develop optimal detection approaches for physical parameters or trace level monitoring of chemical and biomolecules. Four groups of carbon allotropes, including carbon nanotubes (CNT), carbon dots (CDs), graphene, and nanodiamonds (NDs), will be studied. Commonly adopted synthesis approaches, classification of various deposition techniques for the integration of carbon allotropes as the thin film coating of OFS as well as numerous examples of these carbon allotrope-based OFS will also be outlined.

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Full-colour carbon dots: from energy-efficient synthesis to concentration-dependent photoluminescence properties

Cited by 188 publications

References 29 publications

Precisely Controlled Up/Down‐Conversion Liquid and Solid State Photoluminescence of Carbon Dots

Precisely Controlled Up/Down‐Conversion Liquid and Solid State Photoluminescence of Carbon Dots

Full‐Color Emission Polymer Carbon Dots with Quench‐Resistant Solid‐State Fluorescence

Carbon Allotrope-Based Optical Fibers for Environmental and Biological Sensing: A Review

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