Corrugated structure through a spin-coating process for enhanced light extraction from organic light-emitting diodes

Woo Jin Hyun, Sang Hyuk Im, O. Ok Park, Byung Doo Chin

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

We have demonstrated a simple fabrication method for an out-coupling structure to enhance light extraction from organic light-emitting diodes (OLEDs). Spin-coating of SiO2 and TiOx sol mixture solution develops corrugated film. The structural evolution of the corrugation was explained by the localization of surface tension during the solvent evaporation. The structural parameters of the corrugated structure were characterized by varying the spin-coating speed and the mixing ratio of the solution. Compared to conventional devices, OLEDs with a corrugated structure at the backside of the glass substrate showed increased external quantum efficiency without change in the electroluminescence spectrum. The light extraction enhancement is attributed to the decreased incidence angle at the interface of glass substrate and air.

Original languageEnglish
Pages (from-to)579-585
Number of pages7
JournalOrganic Electronics
Volume13
Issue number4
DOIs
Publication statusPublished - 2012 Apr
Externally publishedYes

Keywords

  • Corrugated structure
  • Light extraction
  • Organic light-emitting diodes
  • Out-coupling structure
  • Striation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry
  • Electrical and Electronic Engineering

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