Simulation of crystal field levels and the barycenters are conducted, based on the fluorescence spectra of GdOBr∶Eu under ambient and high pressures. Calculated results are concide with experimental results very well. Variations of Slater and spin-orbit parameters with pressure are obtained. With pressure increasing, B40,B60 increase, B64 decreases, and B20 and B44 show some what fluctuating variations. Strength of the crystal field decreases with increasing pressure from 0GPa to about 8GPa, then increases slightly until 12GPa. Variation of spin-orbit parameter is similar to that of crystal field strength. Slater parameters Ei(i=1—3) show different variations for different i under pressures. E1∶E2∶E3 is little short of the value of hydrogenic ratio, but varies slightly with increasing pressure. To reveal physical significance in the variations of these parameters, comparison with variations with different hosts are made.
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