Materials Research Bulletin, Vol.111, 146-153, 2019
In-situ synthesis and enhanced upconversion luminescence of Y2O3/Y2O2S:Yb3+,Er3+/Tm3+ nanocomposites by reduction of Y2O3:Yb3+,Er3+/Tm3+
Y2O3/Y2O2S:Ln(3+) (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:Ln(3+) increased, and then declined with the rising amount of sulfur powder. Especially, the Y2O3/Y2O2S:Ln(3+) nanocomposites can emit brighter upconversion luminescence than those of Y2O3:Ln(3+) and Y2O2S:Ln(3+). In terms of Y2O3/Y2O2S:Yb3+,Er3+ nanocomposites which were prepared with 0.025g sulfur powder, an unusual (4)G(11/2) -> I-4(15/2) and F-4(9/2) -> I-4(15/2) 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:Yb-3,Er3+ @Au was only 0.066 mu mol/L. The proposed approach, which we have mentioned above, holds a great practical value for diabetes mellitus detection and clinical diagnosis.