Engineering surface states of carbon dots to achieve controllable luminescence for solid-luminescent composites and sensitive Be2+ detection

Li, Xiaoming; Zhang, Shengli; Kulinich, Sergei A.; Li, Yanli; Zeng, Haibo

doi:10.1038/srep04976

Cited by 605 publications

(491 citation statements)

References 60 publications

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“…[34][35][36][37] However, up to now, no research on surface chemical states can be found for IPQDs. Figure 7 presents the X-ray photoelectron spectroscopy (XPS) results of CsPbBr 3 CPB-M and CPB-C QDs.…”

Section: Surface Self-passivation and Cspbx 3 @X Quantum-well Band Almentioning

confidence: 98%

CsPbX₃ Quantum Dots for Lighting and Displays: Room‐Temperature Synthesis, Photoluminescence Superiorities, Underlying Origins and White Light‐Emitting Diodes

Zhang

et al. 2016

Adv Funct Materials

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2435wileyonlinelibrary.com IntroductionQuantum dots (QDs), combined with unique optical, electrical properties and solution processed functional applications, have been studied intensively for decades. [ 1,2 ] Recently, Kovalenko and co-workers and Li and co-workers developed CsPbX 3 (X = Cl, Br, I) inorganic perovskite quantum dots (IPQDs), which exhibited ultrahigh photoluminescence (PL) quantum yields (QYs), lowthreshold lasing, and multicolor electroluminescence. However, the usual synthesis needs high temperature, inert gas protection, and localized injection operation, which are severely against applications. Moreover, the so unexpectedly high QYs are very confusing. Here, for the fi rst time, the IPQDs' roomtemperature (RT) synthesis, superior PL, underlying origins and potentials in lighting and displays are reported. The synthesis is designed according to supersaturated recrystallization (SR), which is operated at RT, within few seconds, free from inert gas and injection operation. Although formed at RT, IPQDs' PLs have QYs of 80%, 95%, 70%, and FWHMs of 35, 20, and 18 nm for red, green, and blue emissions. As to the origins, the observed 40 meV exciton binding energy, halogen self-passivation effect, and CsPbX 3 @X quantumwell band alignment are proposed to guarantee the excitons generation and high-rate radiative recombination at RT. Moreover, such superior optical merits endow them with promising potentials in lighting and displays, which are primarily demonstrated by the white light-emitting diodes with tunable color temperature and wide color gamut.

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Section: Surface Self-passivation and Cspbx 3 @X Quantum-well Band Almentioning

confidence: 98%

CsPbX₃ Quantum Dots for Lighting and Displays: Room‐Temperature Synthesis, Photoluminescence Superiorities, Underlying Origins and White Light‐Emitting Diodes

Zhang

et al. 2016

Adv Funct Materials

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2,186

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1,805

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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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“…30,31 The existence of many hydroxyl and/or carboxyl moieties on their surface facilitates their surface functionalization with various organic, polymeric, inorganic, or biological species. 32,33 This could inuence their uorescence properties.…”

Section: -29mentioning

confidence: 99%

Cyto-toxicity, biocompatibility and cellular response of carbon dots–plasmonic based nano-hybrids for bioimaging

et al. 2017

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In this study, hybrid carbon dots-plasmonic nanostructures including carbon dots/polyethyleneimine/gold (C-dots/PEI/Au), and carbon dots/polyethyleneimine/silver (C-dots/PEI/Ag) have been prepared using a microwave irradiation method. The prepared hybrid nanostructures have been characterized via optical spectroscopy, high resolution transmission electron microscopy (HRTEM), and X-ray diffraction (XRD).A remarkable enhancement in the optical parameters, such as absorptivity and quantum yield (QY), has been observed for the hybrid nanostructure compared to pure carbon dots. This plasmonic enhancement was more pronounced in the presence of silver (C-dots/PEI/Ag nanohybrid) than that of gold (C-dots/PEI/Au nanohybrid). This is referred to the low intrinsic loss and the degree of the overlap between the absorption spectra of silver nanoparticles and carbon dots. Furthermore, the biocompatibility assay and cellular response on epithelial kidney (Vero) normal cell has been investigated.The results showed that the optimal dose of treatment is about $200 mg ml À1 using both C-dots/PEI/Au or C-dots/PEI/Ag, nano-hybrids could be used safely in diagnostic bioimaging applications.

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Engineering surface states of carbon dots to achieve controllable luminescence for solid-luminescent composites and sensitive Be2+ detection

Cited by 605 publications

References 60 publications

CsPbX₃ Quantum Dots for Lighting and Displays: Room‐Temperature Synthesis, Photoluminescence Superiorities, Underlying Origins and White Light‐Emitting Diodes

CsPbX₃ Quantum Dots for Lighting and Displays: Room‐Temperature Synthesis, Photoluminescence Superiorities, Underlying Origins and White Light‐Emitting Diodes

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

Cyto-toxicity, biocompatibility and cellular response of carbon dots–plasmonic based nano-hybrids for bioimaging

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Engineering surface states of carbon dots to achieve controllable luminescence for solid-luminescent composites and sensitive Be2+ detection

Cited by 605 publications

References 60 publications

CsPbX3 Quantum Dots for Lighting and Displays: Room‐Temperature Synthesis, Photoluminescence Superiorities, Underlying Origins and White Light‐Emitting Diodes

CsPbX3 Quantum Dots for Lighting and Displays: Room‐Temperature Synthesis, Photoluminescence Superiorities, Underlying Origins and White Light‐Emitting Diodes

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

Cyto-toxicity, biocompatibility and cellular response of carbon dots–plasmonic based nano-hybrids for bioimaging

Contact Info

Product

Resources

About

CsPbX₃ Quantum Dots for Lighting and Displays: Room‐Temperature Synthesis, Photoluminescence Superiorities, Underlying Origins and White Light‐Emitting Diodes

CsPbX₃ Quantum Dots for Lighting and Displays: Room‐Temperature Synthesis, Photoluminescence Superiorities, Underlying Origins and White Light‐Emitting Diodes

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