Flexible white organic light-emitting diodes with a multi-metal electrode and a new combination of heteroleptic iridium compound

Abstract

Transparent electrodes and heteroleptic iridium complexes have attracted tremendous scientific interest to organic light-emitting diodes (OLEDs) because they have an advantage in that transparent electrodes can replace indium-tin-oxide (ITO) electrode that has structural defects or diffuse indium into the organic layer. Moreover, heteroleptic iridium complexes exhibit high luminescence and quantum yield, as well as superior device performance. Therefore, we propose the use of flexible white OLEDs with semitransparent Ni/Ag/Ni multi-metal layers and a new combination of iridium complex as an orange phosphorescent emitter. We demonstrate that flexible white OLEDs with ITO-free electrodes and new orange phosphorescent emitters have the potential of stable electrical and optical characteristics.