Journal
CHEMISTRYSELECT
Volume 2, Issue 14, Pages 4058-4062Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/slct.201700786
Keywords
carbon dot; delayed fluorescence; intersystem crossing; room temperature phosphorescence
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Herein we report the observation of room-temperature phosphorescence from carbon dots (CDs) embedded in aluminium sulfate. Phosphorescence emission in CDs was achieved by incorporating C=O/C=N functionalities on the carbon dots (CDs) in a single-step reaction. Benzene-1, 3, 5-tricarboxylic acid and formamide were used as precursors, and the resulting CDs in aqueous dispersion show excellent fluorescence in the blue region with quantum yield about 42.7%. On embedding CDs in aluminum sulfate, a green after-glow, with phosphorescence life-time of similar to 876ms was observed. The 1931 CIE color parameters corresponding to the phosphorescence emission (0.26, 0.36) indicated that the emission is in the white-gamut region of the chromaticity diagram.
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