Improved out-coupling efficiency of organic light emitting diodes fabricated on a TiO2 planarization layer with embedded Si oxide nanostructures

Young Hoon Sung, Pil Hoon Jung, Kyung Hoon Han, Yang Doo Kim, Jang Joo Kim, Heon Lee

Research output: Contribution to journalArticle

5 Citations (Scopus)


In order to increase the out-coupling efficiency of organic light emitting diodes, conical Si oxide nanostructures were formed on a glass substrate using nanoimprint lithography with hydrogen silsesquioxane. Then, the substrate was planarized with TiO2 nanoparticles. Since TiO2 nanoparticles have a higher refractive index than Si oxide, the surface of substrate is physically flat, but optically undulated in a manner that enables optical scattering and suppression of total internal reflection. Subsequently, OLEDs formed on a substrate with nanostructured Si oxide and a TiO2 planarization layer exhibit a 25% increase in out-coupling efficiency by suppressing total internal reflection.

Original languageEnglish
Pages (from-to)828-832
Number of pages5
JournalOptical Materials
Publication statusPublished - 2017 Oct 1



  • Light extraction
  • Nanoimprint
  • OLED
  • Refractive index
  • TiO

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Computer Science(all)
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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