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Photocatalytic fixation of nitrogen has been recognized as a green and promising strategy for ammonia synthesis under ambient conditions.However,the efficient reduction of nitrogen remains a challenge due to high activation energy of nitrogen and low utilization of solar energy.Herein,lanthanum oxyfluoride with different doping content of Pr3+ (LaOF∶xPr3+) upconversion nanorods were synthesized by microwave hydrothermal method.Results indicated that the doping of Pr3+ generated considerable defects on the surface of LaOF which acted as the adsorption and activation center for nitrogen.Meanwhile,the Pr3+ ion narrowed the band gap and broadened the light response range of LaOF because LaOF∶Pr3+ can upconvert visible light into ultraviolet light,which excite LaOF nanorods and improve the utilization of solar light.The doping amount of Pr3+ had critical effect on the photocatalytic nitrogen fixation performance which reached as high as 180 μmol·L-1 ·h-1 when the molar ratio of Pr3+ to LaOF was optimized to be 2％.