Ultraviolet (UV)-enhanced planar diffused silicon photodiodes are designed for low-light-level detection in the UV spectral range. The UVD photodiodes peak at 970 nm and UVE planar devices peak at 720 nm and suppress the near-infrared. They are suited for applications in medical instrumentation, pollution monitoring, spectroscopy, fluorescence, water purification, and UV exposure meters.

(From:https://www.laserfocusworld.com/articles/2018/03/uv-silicon-photodiodes-from-osi-optoelectronics-have-uses-in-many-applications.html)