Long lifetime pure organic phosphorescence based on water soluble carbon dots

Deng, Yehao; Zhao, Dongxu; Chen, Xing; Wang, Fei; Song, Hang; Shen, Dezhen

doi:10.1039/c3cc42600a

Cited by 459 publications

(444 citation statements)

References 34 publications

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“…6 They have been applied in cell and small animal bioimaging, 2,3,7 fabrication of light-emitting devices (LED), 8 inks for printing patterns, 9,10 and photocatalysis for photo-assisted catalytic reactions. 11 Moreover, C-dots have been developed to act as fluorescent probes for the detection of some anions and cations.…”

Section: Introductionmentioning

confidence: 99%

Preparation of europium complex-conjugated carbon dots for ratiometric fluorescence detection of copper(ii) ions

Tang

et al. 2014

New J. Chem.

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In this work, by conjugating a europium complex, 4,4 0 -bis(1 00 ,1 00 ,1 00 ,2 00 ,2 00 ,3 00 ,3 00 -heptafluoro-4 00 ,6 00 -hexanedion-6 00 -yl)chlorosulfo-o-terphenyl-Eu 3+ (BHHCT-Eu 3+ ), onto the surface of carbon dots (C-dots), a new type of dual-fluorophore nanoparticle, C-dots-BHHCT-Eu 3+ , has been successfully prepared for the ratiometric fluorescence detection of Cu 2+ ions in aqueous media. The results of transmission electron microscopy (TEM) and fluorescence spectroscopy characterization indicate that the nanoparticles are monodisperse, spherical and uniform in size (B8.6 nm in diameter), and have stable and well-resolved dual-wavelength emission properties. Under excitation at 337 nm, the composite nanoparticles of C-dots-BHHCT-Eu 3+ exhibit two emission peaks at 410 nm and 615 nm, respectively. Upon the addition of Cu 2+ ions, the emission intensity of the nanoparticles at 615 nm is significantly decreased, while that at 410 nm shows no response to the addition of Cu 2+ ions. Correspondingly, the emission intensity ratio, I 615 /I 410 , shows a good linearity against the concentration of Cu 2+ ions. In addition, the investigation results of fluorescence responses of the nanoparticles to different metal ions reveal that the fluorescence response of C-dots-BHHCT-Eu 3+ to Cu 2+ ions is highly specific without interference from other metal ions. All of the results suggest that the new dual-fluorophore composite nanoparticles could be used as a ratiometric fluorescence probe for the detection of Cu 2+ ions in aqueous media with high selectivity and sensitivity.

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Section: Introductionmentioning

confidence: 99%

Preparation of europium complex-conjugated carbon dots for ratiometric fluorescence detection of copper(ii) ions

Tang

et al. 2014

New J. Chem.

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“…Typically, EDTA is calcinated at 400 C under nitrogen atmosphere for 2 h. Through the decomposition, especially decarboxylation, nitrogen-doped CDs are formed. These were described to have an average size of about 7.5 nm and to show blue luminescence at λ max~4 00 nm with a quantum yield of about 40% [32][33][34].…”

Section: Bottom-up Preparation Of Cdsmentioning

confidence: 99%

Carbon Nanodots: Synthesis, Characterization, and Bioanalytical Applications

Lemberger

Hirsch

Wegener

2014

Measuring Biological Impacts of Nanomaterials

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Carbon dots (CDs) are a new class of carbon-rich nanoparticles with exciting physicochemical properties that make them an interesting material for bioanalytical applications. Since their first description in 2004, several preparation techniques have been developed and described in literature, either starting from carbon raw materials (e.g., soot, graphite) or molecular precursors (e.g., carbohydrates, citric acid). The resulting particles are typically only a few nanometers in size, and their surfaces are decorated with functional groups that are rich in oxygen. The presence of oxygenated functionalities on the surface renders the particles dispersible in water. Carbon dots contain a fraction of carbon atoms that are sp 2 hybridized with delocalized electrons on the surface -the basis for the particles' characteristic photoluminescence. The wavelength of the emitted light is dependent on the wavelength of the excitation source and shows remarkable photostability. Carbon dots are also readily excited in the NIR but still emit visible light (upconverted photoluminescence) which provides significant advantages for in vivo imaging. Nowadays CDs are considered as emerging tools in luminescence-based bioanalytics with their full potential yet to be discovered.

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“…Similar room temperature phosphorescence (RTP) has been observed in carbon dots, and the reported RTP comes from the triplet state of the aromatic carbonyl group. 22 What calls for special attention is that energy of the singlet and triplet were 2.76 (450 nm) and 2.48 eV (500 nm), respectively, in our experiment, suggesting that the energy gap between phosphorescence and uorescence was narrow. Generally, it was previously assumed that the S 1 level was 0.5-1.0 eV higher in energy than the T 1 level due to the electron exchange energy between these levels.…”

mentioning

confidence: 97%

“…21,22 In this study, we demonstrate the existence of phosphorescence from a large-scale graphene oxide sheet at room temperature for the rst time. Time-resolved uorescence spectroscopy and ultra-fast femtosecond transient absorption were used to reveal the intersystem crossing (ISC) dynamics as well as the mechanism of the ISC induced excitation-wavelength dependent uorescence.…”

Section: Introductionmentioning

confidence: 99%

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The phosphorescence and excitation-wavelength dependent fluorescence kinetics of large-scale graphene oxide nanosheets

Zhao

Zhang

et al. 2017

RSC Adv.

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In this study, phosphorescence emission and a strong excitation-wavelength dependent fluorescence has been found in large-scale graphene oxide (GO) nanosheets. GO was covalently functionalized with triphenylamine (GO-CONH-TPA) in order to enhance the GO fluorescence quantum yield to 18%. The intersystem crossing (ISC) dynamics were studied using a femtosecond transient absorption technique, which appeared in the same timescale as the fluorescence dynamics of GO-CONH-TPA in both a polar solvent and solid film. Therefore, both, the solvation (several hundreds of picoseconds) and the intersystem crossing (ISC) gave rise to the strong excitation-wavelength dependent fluorescence.Moreover, the phosphorescence emission of the GO-CONH-TPA film at room temperature has been described for the first time in this report, and the lifetime of phosphorescence was found to be 6.95 ms.The fluorescence kinetics of GO-CONH-TPA were attributed to the aromatic hydrocarbon-carboxylic domain structure of GO.

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Long lifetime pure organic phosphorescence based on water soluble carbon dots

Cited by 459 publications

References 34 publications

Preparation of europium complex-conjugated carbon dots for ratiometric fluorescence detection of copper(ii) ions

Preparation of europium complex-conjugated carbon dots for ratiometric fluorescence detection of copper(ii) ions

Carbon Nanodots: Synthesis, Characterization, and Bioanalytical Applications

The phosphorescence and excitation-wavelength dependent fluorescence kinetics of large-scale graphene oxide nanosheets

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