title: Enhancing waveguided light extraction in organic LEDs using an ultra-low-index grid.
abstract: Improved outcoupling of light into substrate modes of an organic LED (OLED) by an ultra-low index of refraction (n=1.15), porous SiO(2) grid (UltraLIG) fabricated using glancing-angle deposition is demonstrated. Outcoupling into the substrate for electrophosphorescent tris(2-phenylpyridine) iridium [Ir(ppy)(3)]-based OLEDs grown on substrates with the UltraLIG is increased by 48% over a conventional device at a luminance of 100 cd/m(2). With efficient light outcoupling at the substrate-air interface, the UltraLIG devices attain eta(EQE)=22.5% and eta(P)=64 lm/W at their peak efficiencies, a nearly threefold increase over an analogous conventional OLED.
authors.affiliation: Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA.
authors.forename: Michael
authors.initials: M
authors.lastname: Slootsky
authors.forename: Stephen R
authors.initials: SR
authors.lastname: Forrest