Thomas Just Sørensen is a Professor in the Department of Chemistry at the University of Copenhagen's Faculty of Science. His research focuses on lanthanide-based molecular systems with applications in optical authentication and photophysics. Affiliated with the university's chemistry department since at least 2011, he maintains active research groups and industry collaborations. His primary research interests include lanthanide coordination chemistry , molecular photophysics , and optical authentication technologies . He investigates symmetry properties of lanthanide complexes, develops chloride-binding systems, and creates physical unclonable functions (PUFs) for anti-counterfeiting. His work bridges fundamental inorganic chemistry with practical security applications. His publication trends show consistent focus on lanthanide luminescence (2017-2025), with recent expansion into computational symmetry analysis (2024) and crystallization mechanisms (2025). Key journals include Journal of Physical Chemistry , Inorganic Chemistry , and Nature Reviews Chemistry . Scientific awards: The Lundbeck Foundation’s Talent Prize (2011) Sørensen actively participates in f-element chemistry conferences including ACS National Meetings and Rare Earth Research Conferences. He has founded two commercial ventures: Pufin-ID (optical authentication solutions) and KU-dyes (specialty dyes), demonstrating strong industry translation of his research. His laboratory focuses on synthesizing and characterizing lanthanide complexes for security applications, with particular emphasis on luminescence-based detection systems and molecular design for aqueous environments.