Abstract:
Yb3+, Er3+ co-doped MWO4 (M = Cd, Ba) nanocrystals were prepared via a hydrothermal method, and the composition, morphology and fluorescence property of the products were characterized by x-ray diffraction(XRD), scan electron microscope(SEM), energy-dispersive x-ray spectroscope(EDS) and fluorescence spectrophotometer. The results show that the luminescence condition of Yb3+, Er3+ co-doped tungstate is dependent on the type of M. CdWO4 :Yb3+, Er3+ nanocrystals synthesized by the hydrothermal method can emit green up-conversion fluorescence when they are excited by 980 nm infrared light. However, BaWO4: Yb3+, Er3+ can emit the intense green up-conversion fluorescences when they are annealed at 900 ℃. The effect of temperature on the up-conversion fluorescent intensity was also studied, and the properties of the up-conversion luminescence were discussed.
