Efficient electron injection in organic light-emitting diodes using lithium quinolate/Ca/Al cathodes

Abstract

Device performances of green devices with cathode structure of lithium quinolate Liq /Ca/Al were investigated and electron injection mechanism was studied using ultraviolet photoelectron spectroscopy. Power efficiency could be improved by 70% by using Liq/Ca/Al cathode structure due to efficient electron injection, and interfacial energy barrier lowering by Liq/Ca/Al metal cathode was observed.