Tin Oxide as a Cathode in Organic Light-Emitting Diodes

Abstract

An alternative to indium tin oxide (ITO) as the cathode in organic light-emitting diodes (LEDs) is suggested: tin oxide. ITO can lead to problems of contamination of the polymer layer with indium, causing a reduction in radiant recombination and, in turn, diminished device brightness. The general consequences of the use of a semiconductor as the charge injection electrode material are analyzed, leading to the conclusion that the formation of an electron accumulation layer facilitates charge injection in the case of tin oxide.