Gd_2O_2S∶Tb~(3+)micro/submicro crystals were prepared by high temperature solid phase method and the effects of reaction conditions on the crystals' growth and its luminescence properties were investigated.By means of characterization methods of field emission scanning electron microscopy(FE-SEM),high-resolution transmission electron microscope(HRTEM),the X-ray powder diffraction(XRD)and fluorescence spectroscopy(PL),the results obtained show that each factor such as reaction time,temperature and Tb~(3+)dop...