Amongst the different stimuli, light offers particular advantages for triggering brush response: precise spatial and temporal control and tunable dosage, remote modulation, room temperature operation, and biocompatibility if excitation occurs at wavelengths longer than 320 nm. We have developed photoresponsive brushes based on photoremovable chromophores that generate ionizable and charged groups along the brush upon light exposure by releasing a photolabile group attached to side chain ionisable groups (i.e. COOH, NH2). Charge generation in the brush structure after irradiation increased hydrophilicity at the exposed regions and triggered wettability changes and pH-tunable response. We study the light-triggered properties of these systems by means of QCM-D techniques.