title: Poly(3,4-ethylenedioxythiophene) Derived from Poly(ionic liquid) for the Use as Hole-Injecting Material in Organic Light-Emitting Diodes.
abstract: We report that poly(3,4-ethylenedioxythiophene) derived from poly(ionic liquid) (PEDOT:PIL) constitutes a unique polymeric hole-injecting material capable of improving device lifetime in organic light-emitting diodes (OLEDs). Imidazolium-based poly(ionic liquid)s were engineered to impart non-acidic and non-aqueous properties to PEDOT without compromising any other properties of PEDOT. A fluorescent OLED was fabricated using PEDOT:PIL as a hole-injection layer and subjected to a performance evaluation test. In comparison with a control device using a conventional PEDOT-based material, the device with PEDOT:PIL was found to achieve a significant improvement in terms of device lifetime. This improvement was attributed to a lower indium content in the PEDOT:PIL layer, which can be also interpreted as the effective protection characteristics of PEDOT:PIL for indium extraction from the electrodes.
authors.affiliation: Department of Materials Science and Engineering, Korea University 5-1 Anam-dong, Seongbuk-gu, Seoul 137-713, Korea.
authors.forename: Taeyoung
authors.initials: T
authors.lastname: Kim
authors.forename: Minwon
authors.initials: M
authors.lastname: Suh
authors.forename: Soon Jae
authors.initials: SJ
authors.lastname: Kwon
authors.forename: Tae Hee
authors.initials: TH
authors.lastname: Lee
authors.forename: Jong Eun
authors.initials: JE
authors.lastname: Kim
authors.forename: You Jong
authors.initials: YJ
authors.lastname: Lee
authors.forename: Joo Hyung
authors.initials: JH
authors.lastname: Kim
authors.forename: Munpyo
authors.initials: M
authors.lastname: Hong
authors.forename: Kwang S
authors.initials: KS
authors.lastname: Suh