Abstract: Gd₂O₃ ∶ Ｅｕ^３＋，Gd₂O₃∶ Ｙｂ^3＋and Gd₂O₃∶ Ｅｕ^３＋，Ｙｂ^3＋ phosphors were prepared by sol-gel method. The influence of preparing condition was studied，and their structures were characterized. The results showed that the concentration quenching phenomenon should take place if the concentration of Yb³⁺is high. Eu³⁺ could transfer energy to adjacent Yb³⁺ ions effectively through cooperative energy transfer process and the cross relaxation process. Upon excitation of the characteristic excitation of Eu³⁺ at 314 nm, the characteristic emission of Eu³⁺ from 550~750 nm and NIR emissions of Yb³⁺ characteristic emission from 900~1100 nm were obtained. The obtained  Gd₂O₃∶ Ｅｕ^３＋，Ｙｂ^3＋ phosphors could transfer 300~550 nm high-energy photon which was weaker to NIR photon which was obsorbed strongly, which could improve the photovoltaic efficiency of the Si-solar cell