State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,
Donghua University, Shanghai 201620, China
Keywords:
-
CLC:
PACS:
TB34\TQ124.3
DOI:
10.7502/j.issn.1674-3962.2014.02.08
DocumentCode:
Abstract:
Ytterbium (Yb3+) and erbium (Er3+) ions codoped sodium yttrium fluoride was prepared by precipitation method in the presence of EDTA as a chelating agent. The research is mainly focused on the effect of EDTA and calcination temperature on the powder crystal phase, surface morphology and the luminous performance. The phase composition, microstructure and property of luminescence are characterized by XRD, SEM and fluorescence spectrophotometer. The experimental results showed that with the increase of heat treatment, phase transition from cubic to hexagonal of NaYF4:Yb3+, Er3+ powder occurred. When the temperature reached higher than 600 ℃, the hexagonal phase gradually transformed to cubic phase, and the size of the particles increased gradually, from approximately spherical to random shape; The luminous intensity of NaYF4: Yb3+, Er3+ is closely related to heat treatment temperature, which has an important effect on the luminous properties. NaYF4:Yb3+,Er3+ heated at 600 ℃ shows the relative strongest upconversion(UC) luminous intensity; The powder synthesized with EDTA shows evident effect on the intensity of UC emission, and makes UC luminous intensity weaker; NaYF4:Yb3+,Er3+ has a good thermal stability below 1 000 ℃.