Improvement in the Ductility of Organic Semiconductor Materials Used in a Flexible Organic Light Emitting Diode

Abstract

Tensile strain testing was conducted on standard thin films: Tris(8-hydroxyquinolinato)aluminum (Alq₃), Bis [N-(1-naphthyl)-N-pheny] benzidine) (α-NPD), and mixed layers of 1/1 Alq₃/α-NPD. Alq₃ films were found to possess the highest ductility and the ductility of α-NPD thin films was found to improve by mixing with Alq₃. In order to improve the ductility of the OLED with a conventional structure of glass/indium-zinc-oxide (IZO)/molybdenum oxide (MoO)/α-NPD/ Alq₃/MgAg, the α-NPD layer was replaced by a mixed layer of Alq₃ and α-NPD.