Abstract: 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 microstructures 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℃.