Corrugated sapphire substrates for organic light-emitting diode light extraction

Wooram Youn, Jinhyung Lee, Minfei Xu, Rajiv Singh, Franky So

Research output: Contribution to journalArticlepeer-review

55 Scopus citations


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%.

Original languageEnglish
Pages (from-to)8974-8978
Number of pages5
JournalACS applied materials & interfaces
Issue number17
StatePublished - 6 May 2015
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2015 American Chemical Society.


  • OLED
  • high-refractive-index substrate
  • light extraction
  • surface plasmon mode


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