Journal
OPTICAL MATERIALS
Volume 137, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.optmat.2023.113630
Keywords
Lanthanum-doped; Carbon quantum dots; Fluorescent colorimetric test paper; Anti-counterfeiting; Fe3+
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A novel lanthanum-doped carbon quantum dots (La-CQDs) fluorescence probe was developed for ion detection of Fe3+ based on the fluorescence quenching principle. La-CQDs with a fluorescence quantum yield of 29.93% was prepared in ethanol solution using ammonium citrate as the carbon source and lanthanum nitrate as the dopant. The method showed good linear relationship and a low limit of detection for Fe3+ detection.
Based on the fluorescence quenching principle, a novel lanthanum-doped carbon quantum dots (La-CQDs) fluorescence probe was successfully developed for ion detection of Fe3+. La-CQDs with a fluorescence quantum yield of 29.93% was prepared in ethanol solution using ammonium citrate as the carbon source and lanthanum nitrate as the dopant. The luminescence performance of La-CQDs was enhanced by La doping and maintained over 90% of the maximum fluorescence intensity in different anions, water content and organic solvent environments. In the range of 25-200 mu M, the fluorescence intensity of La-CQDs displayed a good linear relationship (Y = 0.00675X+ 1.07679, R2 = 0.9888) with the concentration of Fe3+ and its limit of detection (LOD) was calculated to be 6.78 mu M. The method was successfully applied to the detection of Fe3+ in green tea and the measurement error was less than 3%. In addition, La-CQDs was developed for fluorescent colorimetric test paper and information anti-counterfeiting, while the fluorescence quenching effect was observed intuitively on the paper.
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