Electrochemiluminescence

During electrochemical reactions in solutions, a light known as Electrochemiluminescence (ECL) or electrogenerated chemiluminescence (ECG) is created. In electrogenerated chemiluminescence, electrochemically generated intermediates go through a highly exergonic process that results in an electronically excited state that emits light after relaxing to a lower-level state. The difference in energy between these two states is represented by the wavelength of the photon of light that is emitted. Redox processes involving electrogenerated species can result in intense electron transfer reactions, which can then excite ECL. A kind of chemiluminescence, such luminescence excitation involves the electrochemical production of one or more reactants on the electrodes. Due to its excellent sensitivity and selectivity, ECL has proven to be quite beneficial in analytical applications. By using electrode potential, it combines the analytical benefits of chemiluminescent analysis (lack of background optical signal) with simplicity of reaction control. Due to its adaptability, easier optical setup than photoluminescence (PL), and better temporal and spatial control than chemiluminescence, it offers remarkable benefits over other standard analytical procedures (CL). By varying the electrode voltage, one may regulate the species that are oxidised or reduced at the electrode and participate in the ECL reaction, increasing the selectivity of ECL analysis.