In order to characterize the photothermal conversion efficiency η, 200µL of a solution of each compound 6a-d is placed in 96-well plate at different concentrations (5/10/20/40 µM) in DMSO. The absorption of these samples was previously measured with a microplates SAFAS Xeniux XML. The irradiation and photothermal measurement setup are a home-made setup composed of a continuous-wave 470 nm blue diode MDL-F-470 laser (2W) connected to a 400µm fiber of CNILasers (Full Name) whose power is modulated by a controller. The thermal camera is a Xi400 camera from Optris (IR camera Optris Xi 400 "spot finder" compact : 382 x 288 Pixel / 80Hz, Objective : 18° x 14° objectiv / f = 20 mm). Finally, the protective enclosure is made with components from Thorlabs.