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A facile and universal strategy for preparation of long wavelength emission carbon dots

Abstract

Carbon dots (CDs) emerged as a new type of fluorescent nanomaterials, and one of the main problems is the tuning of the emission wavelength toward long wavelength region. In this work, the influence of reaction solvents to emission of CDs were systemically studied by using four groups of classical precursors (citrite acid and nitrogenous organic compound). Water and toluene was selected to represent the hydrohobic and hydrophilic reaction medium, respectively. It is interesting to observe that in toluene solvent, all the CD products yield two emission bands, blue and yellow, and the relative intensity of the yellow to blue can be finely tuned by the precursors. As contrast, the CDs formed in water only demonstrate blue emission. The systemical studies indicate that the spectral change results from the content control of carbogenic/defects to surface states and the energy transfer from the carbogenic/defects to surface states. Moreover, solid states luminescent CDs-polymers were fabricated, which also demonstrated continuously tunable emission properties. This work provides a new strategy for recognizing the generation of long wavelength emitting CDs.

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Publication details

The article was received on 21 Aug 2017, accepted on 09 Nov 2017 and first published on 14 Nov 2017


Article type: Paper
DOI: 10.1039/C7DT03089D
Citation: Dalton Trans., 2017, Accepted Manuscript
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    A facile and universal strategy for preparation of long wavelength emission carbon dots

    Y. Liu, T. Zhang, R. Wang, H. Cui and H. Song, Dalton Trans., 2017, Accepted Manuscript , DOI: 10.1039/C7DT03089D

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