The emission and the excitation spectra of GdPO_4∶Eu~(3+) and GdBO_3∶Eu~(3+) prepared by solid state reaction method were investigated using the synchrotron radiation source of SUPERLUMI station of HASYLAB. The energy transfer between Gd~(3+) and Eu~(3+) was discussed with the probability of quantum cutting process. In the excitation spectra monitoring the red emission from Eu~(3+), the distinct lines corresponding to the intraconfigurational 4f-4f transitions from Gd~(3+) were observed for both samples, indicating an efficient energy transfer from host Gd~(3+) ions to the doped Eu~(3+) ions. The efficient energy transfer is necessary for the quantum cutting process based on the two-step energy transfer from Gd~(3+) to Eu~(3+). However, the overlapping of the lines corresponding to Gd~(3+)∶~8S_(7/2)→~6G_J and the broad excitation band (180～270 nm) due to Eu~(3+)-O~(2-) charge transfer states (CTS) around 200 nm cause excitation energy on ()~6G_J levels to dissipate into CTS by direct energy transfer, unfavorable to the cross relaxation energy transfer between Gd~(3+) and Eu~(3+), thus unfavorable to the quantum cutting process. With the help of the general rules governing the energy positions of Eu~(3+)-O~(2-)∶CTS, the suggestions concerning searching suitable oxide hosts for Gd~(3+)-Eu~(3+) quantum cutting were made. The emission and the excitation spectra of GdPO_4: Eu ~ (3+) and GdBO_3: Eu ~ (3+) prepared by solid state reaction method were investigated using the synchrotron radiation source of SUPERLUMI station of HASYLAB. The energy transfer between Gd ~ ( 3+) and Eu ~ (3+) was discussed with the probability of quantum cutting process. In the excitation spectra monitoring the red emission from Eu ~ (3+), the distinct lines corresponding to the intraconfigurational 4f-4f transitions from Gd ~ (3+) were observed for both samples, indicating an efficient energy transfer from host Gd ~ (3+) ions to the doped Eu ~ (3+) ions. The efficient energy transfer is necessary for the quantum cutting process based on the two --step energy transfer from Gd ~ (3+) to Eu ~ (3+). However, the overlapping of the lines corresponding to Gd ~ (3+): ~ 8S_ (7/2) → ~ 6G_J and the broad excitation band (180 ~ 270 nm) due to Eu ~ (3 +) - O ~ (2) charge transfer states (CTS) around 200 nm excitation energy on () ~ 6G_J levels to dissipate into CTS b y direct energy transfer, unfavorable to the cross relaxation energy transfer between Gd ~ (3+) and Eu ~ (3+), thus unfavorable to the quantum cutting process. With the help of the general rules governing the energy positions of Eu ~ ( 3 +) - O ~ (2-): CTS, the authors concerning searching suitable oxide hosts for Gd ~ (3 +) - Eu ~ (3+) quantum cutting were made.