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Issue 23, 2017
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Cool white, persistent room-temperature phosphorescence in carbon dots embedded in a silica gel matrix

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Abstract

Herein we report the observation of room-temperature phosphorescence from carbon dots (CDs) embedded in a silica gel matrix. The precursors used in the synthesis (malonic acid and ethylene diamine) were chosen to have the surface of the CDs rich in C[double bond, length as m-dash]O and C[double bond, length as m-dash]N functionalities. The CDs in an aqueous dispersion exhibit an intense blue fluorescence and upon incorporation into silica gel demonstrate a green after-glow, which is visible even to the naked eye. The phosphorescence measurements indicated that the life-time of phosphorescence emission is about 1.8 s, under 380 nm excitation, which is the highest magnitude reported for CDs in solid-state matrices. Moreover, the 1931 CIE color parameters corresponding to the phosphorescence emission are in the white gamut region of the chromaticity diagram.

Graphical abstract: Cool white, persistent room-temperature phosphorescence in carbon dots embedded in a silica gel matrix

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Publication details

The article was received on 26 Apr 2017, accepted on 19 May 2017 and first published on 31 May 2017


Article type: Paper
DOI: 10.1039/C7CP02731A
Citation: Phys. Chem. Chem. Phys., 2017,19, 15137-15144

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    Cool white, persistent room-temperature phosphorescence in carbon dots embedded in a silica gel matrix

    J. Joseph and A. A. Anappara, Phys. Chem. Chem. Phys., 2017, 19, 15137
    DOI: 10.1039/C7CP02731A

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