Investigation on Synthesis and Property of Tb~(3+)/Dy~(3+) Co-Doped Gd_3AI_5O_(12) Phosphor

摘要

The (Gd_(09-x)Tb_(0.1)Dy_xAl_5O_(12) (x=0-0.04, GdAG:Tb~(3+)/Dy~(3+)) solid solution was acquired by calcining their respective precursor prepared via co-precipitation method at 1500°C. The performance of GdAG:Tb~(3+)/Dy~(3+) powders was characterized by combined technology of FT-IR spectra, XRD, FE-SEM and PL spectrum analyses. The metastable Gd_3Al_5O_(12) could be stabilized by doping smaller Tb~(3+) ions of 10 at.%. Under the optimal ultraviolet excitation wavelength of 275 nm, the GdAG:Tb~(3+)/Dy~(3+) phosphors express vivid green emission peaked at 548 nm which were attributed to the ~5D_4->~7F_5 transition of Tb~(3+). Compared to the Dy~(3+)-free (Gd_(0.9)Tb_(0.1)AG phosphor, the emission intensity of Dy +-doped phosphors display stronger owing to the high energy transfer process between Dy~(3+) and Tb~(3+). The optimal amount of Dy~(3+) in GdAG:Tb~(3+)/Dy~(3+) phosphors was determined to be ~2.5 at.% (x=0.025). The GdAG:Tb~(3+)/Dy~(3+) phosphors developed in present work are prospected to be a new type of green phosphor widely applied in the lighting and display areas.