title: Flexible bottom-emitting white organic light-emitting diodes with semitransparent Ni/Ag/Ni anode.
abstract: We fabricated a flexible bottom-emitting white organic light-emitting diode (BEWOLED) with a structure of PET/Ni/Ag/Ni (3/6/3 nm)/ NPB (50 nm)/mCP (10 nm)/7% FIrpic:mCP (10 nm)/3% Ir(pq)(2) acac:TPBi (5 nm)/7% FIrpic:TPBi (5 nm)/TPBi (10 nm)/Liq (2 nm)/ Al (100 nm). To improve the performance of the BEWOLED, a multilayered metal stack anode of Ni/Ag/Ni treated with oxygen plasma for 60 sec was introduced into the OLED devices. The Ni/Ag/Ni anode effectively enhanced the probability of hole-electron recombination due to an efficient hole injection into and charge balance in an emitting layer. By comparing with a reference WOLED using ITO on glass, it is verified that the flexible BEWOLED showed a similar or better electroluminescence (EL) performance.
authors.affiliation: Department of Information Display, Hongik University, 94 Wausan-ro, Mapo-gu, Seoul 121-791, South Korea.
authors.forename: Ja-Ryong
authors.initials: JR
authors.lastname: Koo
authors.forename: Seok Jae
authors.initials: SJ
authors.lastname: Lee
authors.forename: Ho Won
authors.initials: HW
authors.lastname: Lee
authors.forename: Dong Hyung
authors.initials: DH
authors.lastname: Lee
authors.forename: Hyung Jin
authors.initials: HJ
authors.lastname: Yang
authors.forename: Woo Young
authors.initials: WY
authors.lastname: Kim
authors.forename: Young Kwan
authors.initials: YK
authors.lastname: Kim
mesh_terms: D003116:Color; D055119:Elastic Modulus; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008029:Lighting / Q000295:instrumentation*; D008839:Microelectrodes; D036103:Nanotechnology / Q000295:instrumentation*; D053770:Nanowires / Q000737:chemistry* / Q000648:ultrastructure; D009532:Nickel / Q000737:chemistry*; D012031:Refractometry; D012666:Semiconductors; D012834:Silver / Q000737:chemistry*
chemical_list: D012834:Silver; D009532:Nickel