Abstract: Sr₂SiO₄∶Eu³⁺,Bi³⁺ and SrSiO₃∶Eu³⁺,Bi³⁺ samples were synthesized at high temperature and high pressure. The effect of high pressure on the structure and luminescence properties of the samples were studied. As a comparison, the samples were also prepared by the method of sol-gel at high temperature and atmospheric pressure. The SrSiO₃∶Eu³⁺,Bi³⁺ prepared at atmosphere has a hexagonal phase structure; in the pressure range of 2.34-4.10 GPa, it is transformed into a pseudo-orthorhombic structure(monoclinic), and in the pressure range of 4.10-4.15 GPa, the structure change of Sr₂SiO₄∶Eu³⁺, Bi³⁺ has not been observed, it maintains the monoclinic structure of the samples synthesized at an atmospheric pressure. High pressure makes the luminescence properties of the samples changed obviously. The intensity and the relative quantum luminescent efficiency decrease, the half-width increases obviously and the red shift occurs. The changes of the luminescence properties result from the pressure-induced changes of the crystal structures.

Key words: High pressure and high temperature, Activator, Luminescence characteristics