Molecules (Dec 2023)

Polymer Dispersed Liquid Crystal Imprinted by Microlens Array for Enhanced Outcoupling Efficiency of Organic Light Emitting Diode

  • Seongmin Lim,
  • Hyeon-Sik Ahn,
  • Eun-Jeong Jang,
  • So-Young Boo,
  • Akpeko Gasonoo,
  • Jin-Seog Gwag,
  • Jae-Hyun Lee,
  • Yoonseuk Choi

DOI
https://doi.org/10.3390/molecules29010073
Journal volume & issue
Vol. 29, no. 1
p. 73

Abstract

Read online

In this paper, we demonstrate the use of polymer dispersed liquid crystal (PDLC) imprinted with a microlens array (MLA) via solution process to improve the outcoupling efficiency of organic light emitting diodes (OLEDs). The PDLC, well known for its scattering effect, is an excellent technology for improving the outcoupling efficiency of OLEDs. Additionally, we introduce a simple spin-coating process to fabricate PDLC which is adaptable for future solution-processed OLEDs. The MLA-imprinted PDLC applied OLED shows an enhancement factor of 1.22 in outcoupling efficiency which is a 37.5% increase compared to the existing PDLC techniques without changing the electrical properties of the OLED. Through this approach, we can expect the roll-to-roll based extremely flexible OLED, and with further research on pattering PDLC by various templates, higher outcoupling efficiency is achievable through a simple UV irradiation process.

Keywords