Light emission at electrodes: An electrochemiluminescence demonstration
Electrochemiluminescence involves the production of light near an electrode surface by the generation of species that can undergo highly energetic electron transfer reactions. A demonstration is presented that uses Ru(bpy)32+ (bpy = 2,2'-bipyridine) as the light-emitting molecule and tri-n-propylamine (C9H21N) as a coreactant (i.e., a species capable of generating a strong reductant upon oxidation). Upon application of a 3-volt potential to a platinum electrode immersed in a Ru(bpy)32+-C9H21N solution, an orange glow, readily visible in a semidarkened room, is produced at the electrode.
second-year undergraduate, demonstrations, tested Demonstrations, electrochemistry
Bolton, Ed, and Mark M. Richter. "Light emission at electrodes: an electrochemiluminescence demonstration." Journal of Chemical Education 78, no. 5 (2001): 641.
Journal of Chemical Education