Herein we disclose our study toward the synthesis of aryl phosphonates using either photocatalytic conditions or a photoinduced process. First, a phosphonylation reaction catalyzed by a copper complex was developed in batch, but unfortunately, it was not efficient under continuous flow. Alternatively, a photoinduced phosphonylation reaction was developed in continuous flow with a moderate efficiency. Finally, to enhance the yields observed under the continuous flow conditions for the scale-up, a complementary approach using another commercially available photoreactor was suggested to tackle the modest productivity observed in continuous flow.