Abstract

One-step solvothermal method was used to synthesize red fluorescent carbon quantum dots (R-CQDs) with ultra-narrow bandwidth emission by using the titanyl-phthalocyanine (TiOPc) as the reaction precursor and ethanol as the organic solvent . We characterized the structural and optical properties of the R-CQDs by a variety of spectroscopic methods such as photoluminescence . Our studies have shown that the photoluminescence properties of R-CQDs are independent of the excitation wavelength. The strongest emission peak is at 674 nm, the full width at half maximum (FWHM) is only 23.2 nm, and the quantum yield (QY) is 7.54%. In addition, we also studied the application of the R-CQDs as a potential diagnostic marker. It was observed that the R-CQDs could enter the aloe tissue. The R- CQDs reported here have a narrow width and excellent QY characteristics, which can be attributed to the surface and edge C = O, C = N groups and Ti doping in the R-CQDs. Such R-CQDs can be widely used in the fields of display device, cell labelling and bio-imaging. • The R-CQDs with an ultra-narrow emission bandwidth were synthesized by using one-step solvothermal method. • The absolute QY of R-CQDs was determined to be 7.54%, and the FWHM of R-CQD was 23.2 nm. • R-CQDs have a nanometer particle size, which can enter into the aloe tissue.

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