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 journalArticlepeer-review

6 Citations (Scopus)

Abstract

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
Volume72
DOIs
Publication statusPublished - 2017 Oct

Bibliographical note

Funding Information:
This research was supported by the Pioneer Research Center Program through the National Research Foundation of Korea funded by the Ministry of Science, ICT and Future Planning ( NRF-2013M3C1A3063597 ). This work was supported by the National Research Foundation of Korea grant funded by the Korea government(MSIP) ( 2016R1A2B3015400 ). This research was supported by LG Innotek KoreaUniversity Nano-Photonics Program.

Publisher Copyright:
© 2017

Keywords

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

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • General Computer Science
  • Atomic and Molecular Physics, and Optics
  • Spectroscopy
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry
  • Electrical and Electronic Engineering

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