Abstract
Y2O3/Y2O2S:Ln3+ (Ln = Yb,Er and Yb,Tm) nanocomposites with enhanced upconversion luminescence were successfully prepared by combining hydrothermal with in-situ synthesis method. Under 980 nm excitation, the upconversion luminescence intensity of Y2O3/Y2O2S:Ln3+ increased, and then declined with the rising amount of sulfur powder. Especially, the Y2O3/Y2O2S:Ln3+ nanocomposites can emit brighter upconversion luminescence than those of Y2O3:Ln3+ and Y2O2S:Ln3+. In terms of Y2O3/Y2O2S:Yb3+,Er3+ nanocomposites which were prepared with 0.025g sulfur powder, an unusual 4G11/2 → 4I15/2 and 4F9/2 → 4I15/2 transitions of Er3+ could be observed. Besides, we have constructed a simple upconversion Y2O3/Y2O2S:Yb3+,Er3+@Au nanocomposite, which can be used for rapid sensing of glucose. The limit of detection of glucose level which based on Y2O3/Y2O2S:Yb3+,Er3+@Au was only 0.066 μmol/L. The proposed approach, which we have mentioned above, holds a great practical value for diabetes mellitus detection and clinical diagnosis.
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