title: Enhanced light extraction efficiency in organic light emitting diodes using a tetragonal photonic crystal with hydrogen silsesquioxane.
abstract: We report an organic light emitting diode (OLED) with a hydrogen silsesquioxane as a scattering material, for enhancing light extraction efficiency. A tetragonal photonic crystal was used as pattern type, and fabricated using a direct printing technique. Planarization was accomplished using TiO₂ solgel solution, having a refractive index identical to that of the indium zinc oxide transparent electrode. The current efficiency and power efficiency of the OLED increased by 17.3% and 43.4% at 10  mA/cm², respectively, without electric degradation.
authors.forename: Yang Doo
authors.initials: YD
authors.lastname: Kim
authors.forename: Kyeong-Hoon
authors.initials: KH
authors.lastname: Han
authors.forename: Sang-Jun
authors.initials: SJ
authors.lastname: Park
authors.forename: Jung-Bum
authors.initials: JB
authors.lastname: Kim
authors.forename: Ju-Hyeon
authors.initials: JH
authors.lastname: Shin
authors.forename: Jang Joo
authors.initials: JJ
authors.lastname: Kim
authors.forename: Heon
authors.initials: H
authors.lastname: Lee