Energy transfer mechanism of GdPO_4: RE~(3+) (RE = Tb, Tm) under VUV-UV excitation

摘要

Polycrystal of GdPO_4:RE~(3+)(RE=Tb, Tm) phosphors were prepared by solid-state method. Vacuum ultraviolet excitation and emission spectrum and the energy transfer mechanism between the host and dopants of Tb~(3+) and Tm~(3+) were investigated respectively. The emission of Gd~(3+) at 313 nm was enhanced by the strong absorption of GTS of Tm~(3+) at 180 nm in GdPO_4: Tm. It has also been concluded that the excitation of Gd~(3+) is transferred to Tb~(3+)and then emission peaks of ~5D_J - > ~7F_J of Tb~(3+) were observed.