Physical model of electrochemiluminescence

P.V.Jaguiro, A.G.Smirnov Belarussian State University of Informatics and Radioelectronics 6, Brovka St., Minsk, Republic Belarus, 2200027

One of the least investigated section of electroluminescence - electrochemiluminescence (ECL) - light emission arising as the result of recombination of organic ions formed by electrochemical reactions - is considered. Carrying out analogy with light emission diodes and gas discharge lamps leads to classifing ECL as liquid-phase recombination electroluminescence. Liquid environment creates specific conditions for electroluminescence process - high concentration of active particles with opportunity of their redistribution in space by hydrodynamic carrying. Well known luminescent systems - organic dye solutions are used as ECL working media. ECL was investigated in thin electrolyteless cells, excited by a direct current and in cells with submicron interelectrode distance, fabricated by microelectronics technology. On the basis of received experimental results the most important physical processes of ECL have been simulated: formation and structure of a double electrical layer at electrode - liquid dielectric interface, charge injection into solution, charge carrying by electrohydrodynamic flows . The main parameters of processes of charge injection and carrying have been calculated from experimental data.