Self-assembled RE2(MO4)3:Ln3+ (RE = Y, La, Gd, Lu; M = W, Mo; Ln = Yb/Er, Yb/Tm) hierarchical microcrystals: Hydrothermal synthesis and up-conversion luminescence

• Some new systems of tungstate microcrystals are synthesized via a hydrothermal process.
• Some new systems of molybdate microcrystals are synthesized via a hydrothermal process.
• The upversion luminescence of some tungstate and molybdate systems are firstly reported.

RE2(MO4)3:Ln3+ (RE = Y, La, Gd, Lu; M = W, Mo; Ln = Yb/Er, Yb/Tm) microstructures with uniform shapes and sizes were synthesized via a hydrothermal method in the presence of hexadecyl trimethyl ammonium bromide (CTAB). The structure and morphology of the as-prepared microcrystals were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), selected area electron diffraction (SAED) and high-resolution transmission electron microscopy (HRTEM). The 3D hierarchical architectures of Y2(MoO4)3:Yb3+/Er3+ and Gd2(WO4)3:Yb3+/Er3+ are self-assembled by numerous nanoflakes. The up-conversion (UC) luminescence properties of these samples were investigated. Obvious differences in up-converted emission spectra among the as-obtained products were observed, and possible reasons were discussed. The corresponding up-conversion mechanism was also proposed.

The upconversion microcrystal phosphors of RE2(MO4)3:Ln3+ (RE = Y, La, Gd, Lu; Ln = Yb/Er, Yb/Tm and M = W, Mo) were synthesized via a hydrothermal technology.Figure optionsDownload high-quality image (208 K)Download as PowerPoint slide