Light Extraction Enhancement in Flexible Organic Light-Emitting Diodes by a Light-Scattering Layer of Dewetted Ag Nanoparticles at Low Temperatures

Junhee Choi, Seonju Kim, Cheol Hwee Park, Jin Ho Kwack, Chan Hyuk Park, Ha Hwang, Hyeong Seop Im, Young Wook Park, Byeong Kwon Ju

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

We demonstrated light extraction improvement by applying a scattering layer of Ag nanoparticles physically synthesized through a low-temperature annealing process to flexible organic light-emitting diodes (OLEDs). In general, increasing the size of Ag nanoparticles is preferred to increase light scattering, but a high-temperature annealing process (∼400 °C) is required to produce them. However, flexible substrates generally cannot withstand high-temperature processes. In this study, we formed Ag nanoparticles at a low temperature of ∼200 °C by inserting a poly(3,4-ethylenedioxythiophene) polystyrene sulfonate buffer layer, thus promoting Ag dewetting. As a result, the scattering layer of enlarged Ag nanoparticles formed at low temperatures increased the external quantum efficiency by 24% in a flexible OLED compared to a reference device.

Original languageEnglish
Pages (from-to)32373-32379
Number of pages7
JournalACS Applied Materials and Interfaces
Volume10
Issue number38
DOIs
Publication statusPublished - 2018 Sep 26
Externally publishedYes

Keywords

  • light extraction
  • light scattering
  • metal nanoparticles
  • organic light-emitting diodes (OLEDs)
  • plasmonics

ASJC Scopus subject areas

  • Materials Science(all)

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