Overview The 7th international workshop on new Photon-Detectors (PD2025) is jointly organised by the Bologna division of the Italian National Institute for Nuclear Physics (INFN Bologna, Italy) and the Department of Physics and Astronomy of the University of Bologna (DIFA UniBo, Italy). The workshop will focus on recent progress and developments in photosensor technologies, including SiPMs, MCPs, APDs, PMTs, hybrid PMTs, digital photosensors and new materials. It will also explore the broad range of applications for these devices in fields such as particle and astroparticle physics, nuclear physics, nuclear medicine, astronomy, and related instrumentation. The programme will feature plenary sessions with both invited and contributed talks, as well as a dedicated poster session. Scientific Program The PD2025 Workshop will cover a broad range of topics reflecting the latest developments and challenges in photon-detector science. The scientific programme is structured around three main thematic areas Application Areas — showcasing the diverse fields where photon detectors play a key role, from fundamental physics to societal impact. Photosensor Technologies — focusing on the design, development, and characterisation of current and emerging photodetector types. Enabling Technologies and Related Topics — highlighting cross-disciplinary innovations that support performance, integration, and future advances. These represent the core themes of the workshop and outline the scope of discussions and presentations that will shape PD2025.