Efficient TADF-based blue OLEDs with 100% stretchability using titanium particle-embedded indium zinc oxide mesh electrodes

Tae Hoon Park, Wanqi Ren, Ho Jin Lee, Nahyun Kim, Kyung Rock Son, Adila Rani, Tae Geun Kim

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

A highly stretchable and transparent electrode is a key element for realizing stretchable organic light-emitting diodes (SOLEDs). To date, several reports have been made on this issue; however, a sufficiently high mechanical stability (i.e., 100% stretchability) has not yet been demonstrated. Herein, we propose a titanium particle-embedded indium zinc oxide (Ti/IZO) mesh electrode fabricated on a Norland optical adhesive (NOA) substrate for the realization of mechanically robust and efficient SOLEDs. Initially, the geometry of the Ti/IZO mesh electrode is optimized based on the simulation and experimental results, which provides a high transmittance (92.5% at 480 nm), low sheet resistance (22.1 Ω/sq), and excellent mechanical stability (no substantial loss under 100% strain; only a 20% resistance change after 1000 stretching cycles), along with a work function of approximately 5.0 eV. Next, Ti/IZO mesh-based thermally activated delayed-fluorescence blue SOLEDs fabricated on NOA substrate are transferred onto prestretched 3 M VHB tape for mechanical testing. Interestingly, the devices stably operate under 100% tensile strain and exhibit an external quantum efficiency of 13.2%, which is 30 and 29% higher than those of devices with IZO and indium tin oxide planar electrodes, respectively. The reduced waveguide mode at the interface and increased outcoupling via corrugated metal islands are attributed to the observed improvement in performance.

Original languageEnglish
Article number66
JournalNPG Asia Materials
Volume14
Issue number1
DOIs
Publication statusPublished - 2022 Dec

Bibliographical note

Funding Information:
This study was supported by the National Research Foundation of Korea, funded by the Korean government (No. 2016R1A3B1908249). This work was also supported by LG Display under the LGD-Korea University Incubation Program.

Publisher Copyright:
© 2022, The Author(s).

ASJC Scopus subject areas

  • Modelling and Simulation
  • General Materials Science
  • Condensed Matter Physics

Fingerprint

Dive into the research topics of 'Efficient TADF-based blue OLEDs with 100% stretchability using titanium particle-embedded indium zinc oxide mesh electrodes'. Together they form a unique fingerprint.

Cite this