title: Corrugated sapphire substrates for organic light-emitting diode light extraction.
abstract: In an organic light-emitting diode (OLED), only about 20-30% of the generated light can be extracted because of the light lost to the thin film guided modes and surface plasmon. Using corrugated high-index-refractive substrates, the thin film guided modes can be effectively out-coupled from the device because of the high index substrate and the loss to the surface plamon is suppressed due to the corrugated structure. With an additional macro lens attached to the substrate to extract the substrate mode, we finally demonstrated a green phosphorescent OLED with an extremely high external quantum efficiency of 63%.
authors.affiliation: Department of Materials Science and Engineering, University of Florida, Gainesville, Florida 32611-6400, United States.
authors.forename: Wooram
authors.initials: W
authors.lastname: Youn
authors.affiliation: Department of Materials Science and Engineering, University of Florida, Gainesville, Florida 32611-6400, United States.
authors.forename: Jinhyung
authors.initials: J
authors.lastname: Lee
authors.affiliation: Department of Materials Science and Engineering, University of Florida, Gainesville, Florida 32611-6400, United States.
authors.forename: Minfei
authors.initials: M
authors.lastname: Xu
authors.affiliation: Department of Materials Science and Engineering, University of Florida, Gainesville, Florida 32611-6400, United States.
authors.forename: Rajiv
authors.initials: R
authors.lastname: Singh
authors.affiliation: Department of Materials Science and Engineering, University of Florida, Gainesville, Florida 32611-6400, United States.
authors.forename: Franky
authors.initials: F
authors.lastname: So
keywords: OLED; high-refractive-index substrate; light extraction; surface plasmon mode