A Simple Method for Fabricating an External Light Extraction Composite Layer with RNS to Improve the Optical Properties of OLEDs

Geun Su Choi, Shin Woo Kang, Eun Jeong Bae, Eun Bi Jang, Dong Hyun Baek, Byeong Kwon Ju, Young Wook Park

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

In this study, we fabricated a random nanostructure (RNS) external light extraction composite layer containing high-refractive-index nanoparticles through a simple and inexpensive solution process and a low-temperature mask-free process. We focused on varying the shape and density of the RNSs and adjusted the concentration of the high-refractive-index nanoparticles to control the optical properties. The RNSs fabricated using a low-temperature mask-free process can use the distance between the nanostructures and various forms to control the diffraction and scattering effects in the visible light wavelength range. Consequently, our film exhibited a direct transmittance of ~85% at a wavelength of 550 nm. Furthermore, when the RNSs’ composite film, manufactured using the low-temperature mask-free process, was applied to organic light-emitting diodes (OLEDs), it exhibited an external quantum efficiency improvement of 32.2% compared with the OLEDs without the RNSs. Therefore, the randomly distributed high-refractive-index nanoparticles on the polymer film can reduce the waveguide mode and total reflection at the substrate/air interface. These films can be used as a scattering layer to reduce the loss of the OLED substrate mode.

Original languageEnglish
Article number1430
JournalNanomaterials
Volume12
Issue number9
DOIs
Publication statusPublished - 2022 May 1

Bibliographical note

Funding Information:
Acknowledgments: This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) and supported by the “Regional Innovation Strategy (RIS)” through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (MOE). We are thankful for the analysis support of the Center for Next Generation Semiconductor Technology at Sunmoon University.

Funding Information:
This research was funded by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2020R1C1C1013567), National Research Foundation of Korea (NRF) funded by the Ministry of Education (MOE) (2021RIS-004).

Publisher Copyright:
© 2022 by the authors. Licensee MDPI, Basel, Switzerland.

Keywords

  • external light extraction
  • nanoparticle
  • organic light-emitting diodes
  • random nanostructure
  • reactive ion etching
  • scattering effect

ASJC Scopus subject areas

  • General Chemical Engineering
  • General Materials Science

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