A morphological study of random nanostructured external light extraction layers for enhancing optical characteristics of OLEDs

Geun Su Choi, Shin Woo Kang, Eun Jeong Bae, Byeong Kwon Ju, Young Wook Park

Research output: Contribution to journalArticlepeer-review

Abstract

This study presents an in-depth investigation of nano-pillar-based external light extraction techniques, focusing on the analysis of light extraction characteristics based on the pillar and plane structures. The nano-pillar-based external light extraction structure is formed by a process technology that allows for the formation and control of the plane thickness. In this study, a random nanostructure layer based on SU-8 was fabricated, and the impact of variations in the overall height and plane height on the light extraction efficiency of the organic light-emitting diode (OLED) was analyzed. The nanostructure layer was easily formed using a low-temperature mask-free process, enabling control of diffraction and scattering effects in the visible wavelength range. The research results demonstrate that the fabricated nanostructure layer exhibited a total transmittance of over 85% in the visible spectrum, with higher light extraction efficiency observed as the thickness of the plane structure approached zero. Furthermore, compared to OLEDs without the random nano-pillar structure (RNPS), the external quantum efficiency and power efficiency were improved by up to 37.5% and 40.4%, respectively. These findings provide valuable insights into the design and optimization strategies for random nano-pillar-based external light extraction structures, contributing to the advancement of OLED technology.

Original languageEnglish
Pages (from-to)14307-14315
Number of pages9
JournalJournal of Materials Chemistry C
Volume11
Issue number41
DOIs
Publication statusPublished - 2023 Sept 22

Bibliographical note

Publisher Copyright:
© 2023 The Royal Society of Chemistry.

ASJC Scopus subject areas

  • General Chemistry
  • Materials Chemistry

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