The light induced synthesis of PEDOT using a single-component photoinitiator such as PAB, and the reaction mechanism of this polymerization was thoroughly studied by our group, previously. PAB is known to undergo photodecomposition under UV-A light, generating phenacyl and bromine radicals . The bromine radical then abstracts an electron from the highly electron-donating thiophene ring of EDOT to form an EDOT radical cation (EDOT •+ ). The coupling between two EDOT •+ leads to the release of HBr, which can concomitantly act as an initiator for the cationic ROP of ECL .