Quantum-Sized Carbon Dots for Bright and Colorful Photoluminescence

Sun, Ya‐Ping; Zhou, Bing; Lin, Yi; Wang, Wei; Fernando, K. A. Shiral; Pathak, Pankaj; Meziani, Mohammed J.; Harruff, Barbara A.; Wang, Xin; Wang, Haifang; Luo, Pengju G.; Yang, Hua; Köse, Muhammet; Chen, Bailin; Veca, L. Monica; Xie, Su‐Yuan

doi:10.1021/ja062677d

Cited by 4,376 publications

(3,580 citation statements)

References 18 publications

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“…[1][2][3][4][5][6][7][8] Especially, CDs, owing to their superior performance in terms of water solubility, stability, toxicity, resistance to photobleaching, and biocompatibility, have recently drawn significant attention. [9][10][11][12][13][14][15] The electron injection from CDs to TiO 2 was demonstrated to be feasible and the CD-sensitized TiO 2 photoelectrodes have been applied in photocatalysis and PVs. 10,[16][17][18][19][20][21] However, it is still a challenge to achieve efficient electron injection from CDs to TiO 2 under sunlight, 21 which is a primary photophysical process in generating photocurrent in CD-based PVs.…”

Section: Introductionmentioning

confidence: 99%

Towards efficient photoinduced charge separation in carbon nanodots and TiO₂ composites in the visible region

Sun

et al. 2015

Phys. Chem. Chem. Phys.

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Towards efficient photoinduced charge separation in carbon nanodots and TiO2 composites in the visible region Sun, M.; Qu, S.; Ji, W.; Jing, P.; Li, D.; Qin, L.; Cao, J.; Zhang, H.; Zhao, J.; Shen, D. General rights It is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. In this work, photoinduced charge separation behaviors in non-long-chain-molecule-functionalized carbon nanodots (CDs) with visible intrinsic absorption (CDs-V) and TiO 2 composites were investigated. Efficient photoinduced electron injection from CDs-V to TiO 2 with a rate of 8.8 Â 10 8 s À1 and efficiency of 91% was achieved in the CDs-V/TiO 2 composites. The CDs-V/TiO 2 composites exhibited excellent photocatalytic activity under visible light irradiation, superior to pure TiO 2 and the CDs with the main absorption band in the ultraviolet region and TiO 2 composites, which indicated that visible photoinduced electrons and holes in such CDs-V/TiO 2 composites could be effectively separated. The incident photon-to-current conversion efficiency (IPCE) results for the CD-sensitized TiO 2 solar cells also agreed with efficient photoinduced charge separation between CDs-V and the TiO 2 electrode in the visible range. These results demonstrate that non-long-chainmolecule-functionlized CDs with a visible intrinsic absorption band could be appropriate candidates for photosensitizers and offer a new possibility for the development of a well performing CD-based photovoltaic system.

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Section: Introductionmentioning

confidence: 99%

Towards efficient photoinduced charge separation in carbon nanodots and TiO₂ composites in the visible region

Sun

et al. 2015

Phys. Chem. Chem. Phys.

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“…Among them, carbon dots are a new class of functional nanomaterials exhibiting their inherently unique photoluminescent properties, such as wavelengthtuneable emission, excellent solubility, good biocompatibility and chemical inertion [7][8][9][10]. Unlike the semiconductor quantum dots derived from heavy metal precursors incurring long term toxicity [11], C-dots are environmentally friendly and lack of known cytotoxicity [12,13].…”

Section: Introductionmentioning

confidence: 99%

“…The mechanism of C-dots associated photoluminescence is not clear completely. The suggested reason behind the luminescence might be the radiative recombination of the energy-trapping sites on the C-dots surface [7]. In order to enhance the quantum yield (QY) of carbon dots, much effort has been directed toward the use of surface passivation method to achieve a strong photoluminescence [13].…”

Section: Introductionmentioning

confidence: 99%

Enhanced photoluminescence and characterization of multicolor carbon dots using plant soot as a carbon source

Tan

Zhang

Tang

et al. 2013

Talanta

116

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“…Moreover, the number of sp 2 and delocalized electrons in the FNP surface confers the optoelectronics properties. [19][20][21][22] The fluorescent quantum yield (%) is estimated to be about 0.131% for blue and 0.228% for green FNPs as well as 0.398% for blue and 0.252% for green P-FNPs. Interestingly, the P-FNPs showed similar fluorescence profiles to the C-FNPs, but generated higher fluorescent intensities, consistent with the increased quantum yield.…”

Section: Resultsmentioning

confidence: 99%

Preparation of carbon dot‐based ratiometric fluorescent probes for cellular imaging from Curcuma longa

Mazrad

Kang

et al. 2017

Luminescence

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This work derived biocompatible and stable probes based on fluorescent nanoparticles (FNPs) from a natural source, Curcuma longa. The multi-color fluorescence emissions from carbonized Curcuma longa (C-FNPs) obtained through defined dehydration conditions are soluble in water and have a small particle size (~17 nm). The surface passivation with polyethylene glycol (PEG) capped with amine groups in FNPs (P-FNPs) generated a probe with a higher quantum yield and longer fluorescence lifetime than obtained with C-FNPs. The X-ray photoelectron spectroscopy and X-ray diffraction spectra confirmed the associated chemical moieties of C-FNPs and P-FNPs. Furthermore, the prepared material showed non-toxic effects with almost 100% cell viability, even at high concentrations. In conclusion, fluorescence sensors from natural sources may be useful for numerous biomedical research applications.

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Quantum-Sized Carbon Dots for Bright and Colorful Photoluminescence

Cited by 4,376 publications

References 18 publications

Towards efficient photoinduced charge separation in carbon nanodots and TiO₂ composites in the visible region

Towards efficient photoinduced charge separation in carbon nanodots and TiO₂ composites in the visible region

Enhanced photoluminescence and characterization of multicolor carbon dots using plant soot as a carbon source

Preparation of carbon dot‐based ratiometric fluorescent probes for cellular imaging from Curcuma longa

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