Inorganic Sol-Gel Process of Preparing Long Afterglow Luminescent Powders

The stable transparent sol of SrAl2O4 was successfully prepared by using cheap inorganic materials as precursors. The uniform needle-like nano-powders were synthesized at low temperature and reduce atmosphere. The conditions and factors of preparing the long afterglow powders of SrAl2O4:Eu2+,Dy3+ by sol-gel process were reported systematically. The microstruc-tures and surface shapes of samples were observed by the transmission electron microscope (TEM). The crystallization processes were determined by the X-ray diffractometer (XRD). The luminescent properties were studied by the fluorescence spectrophotometer. The experimental results show that the luminescent features of samples synthesized by the sol-gel process under the proper conditions are similar to those by solid-state reaction process, but the sintering temperature is reduced about 300℃.