The emission and the excitation spectra of GdPO4∶Eu3+ and GdBO3∶Eu3+ prepared by solid state reaction method were investigated using the synchrotron radiation source of SUPERLUMI station of HASYLAB. The energy transfer between Gd3+ and Eu3+ was discussed with the probability of quantum cutting process. In the excitation spectra monitoring the red emission from Eu3+, the distinct lines corresponding to the intraconfigurational 4f-4f transitions from Gd3+ were observed for both samples, indicating an efficient energy transfer from host Gd3+ ions to the doped Eu3+ ions. The efficient energy transfer is necessary for the quantum cutting process based on the two-step energy transfer from Gd3+ to Eu3+. However, the overlapping of the lines corresponding to Gd3+∶8S7/2→6GJ and the broad excitation band （180～270 nm） due to Eu3+-O2- charge transfer states （CTS） around 200 nm cause excitation energy on （）6GJ levels to dissipate into CTS by direct energy transfer, unfavorable to the cross relaxation energy transfer between Gd3+ and Eu3+, thus unfavorable to the quantum cutting process. With the help of the general rules governing the energy positions of Eu3+-O2-∶CTS, the suggestions concerning searching suitable oxide hosts for Gd3+-Eu3+ quantum cutting were made.
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