The existence of dark matter (DM), supported by a variety of astrophysical measurements, is one of the main puzzles in fundamental physics. As of today, one of the most favoured candidates as a DM particle is a weakly interacting massive particle (WIMP) in the mass range above 1 GeV/c2. DarkSide-50 is a first-generation dual phase liquid argon Time Projection Chamber (TPC) experiment that took data in 2015-2018 at Gran Sasso National Laboratory for a total exposure of 12 ton.day. With a target of only 50 kg of argon it provides the best world limits for a WIMP mass between 1.2-3.6 GeV. Details of the analysis will be presented and interpretations including the Migdal effect or in the framework of leptophilic models will also be shown. Status and prospects for future liquid argon TPCs will finally be discussed.
