Encouraged by our recent success in the synthesis of technologically important conjugated polymers (PMPyr and PMIn) , we focused our attention to the synthesis of another important polymer, PEDOT, using the same methodology. UV-Vis changes of near-UV irradiated EDOT+PAB mixture in ethanol was checked in different time intervals. (Figure ). After the observation of a clear absorption increase in the visible region, we decided to conduct the photopolymerization experiments using higher concentration of reactants. When PAB concentration is high (100 mM) it shows significant absorption in the visible region (Figure ) allowing to switch/tune the irradiation wavelength. Doped PEDOT was prepared by mixing 105 L of EDOT (1 mmol) and 200 mg of PAB (1 mmol) in 2 mL of EtOH inside a test tube which was irradiated inside a photoreactor equipped with 12 lamps emitting light nominally at 355 nm (~100mW/cm 2 ) for near-UV experiment. For visible light experiment 100 mg of PAB (0.5 mmol) was dissolved in 1 mL of EDOT under LEDs emitting at 405 nm (supplementary video 1) and for daylight photopolymerization 100 mM of EDOT was mixed with 100 mM of PAB in ethanol (EtOH) solution (supplementary video 2). All the reactions 'color turned from light yellow to dark green-light black (Figure ) in short time (1-7 min) depending on the concentrations of the reactants and the irradiation wavelength. Control experiments performed in dark showed no change in the color of the reaction. In light of the previous laser-flash photolysis results obtained , the photopolymerization of EDOT should proceed by successive cleavage of the excited triplet state of PAB under near-UV irradiation forming radical cation (polaron) of EDOT monomer which then couple with another radical cation of the monomer by releasing hydrobromic acid (HBr). The newly formed dimer can also couple with another monomer or dimer to form polymeric species in a step-growth manner (Scheme 1).