Photoluminescence Properties of YAI3(B03)4:RE~(3+) (RE=Ce/Dy/Tb) Phosphors

摘要

YAl_3(BO_3)_4 doped with three rare earth (RE) ions namely Ce~(3+) Dy~(3+) and Tb~(3+) were prepared by the conventional solid state diffusion method. The phosphors were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM) and photoluminescence (PL) techniques. PL spectra of Ce-doped samples showed the Ce~(3+) emission characteristic due to the 5d-4f transition. Dy-doped sample upon excitation at 351 nm, showed peaks corresponding to the ~4F_(9/2)→~6H_(15/2) and ~4F_(9/2)→~6H_(13/2) transitions. PL spectra of Tb-doped sample showed peaks corresponding to the ~5D_3→~7F_J transition. Upon excitation at 364 nm, the enhanced luminescence observed in Ce~(3+) co-doped YAl_3(BO_3)_4:Tb~(3+)/Dy~(3+) phosphors is understood as due to energy transfer from Ce~(3+) to Tb~(3+)/Dy~3. The color purity has also been verified by using the chromaticity diagram.