Junction-Free Electrospun Ag Fiber Electrodes for Flexible Organic Light-Emitting Diodes

Junhee Choi, Yong Sub Shim, Cheol Hwee Park, Ha Hwang, Jin Ho Kwack, Dong Jun Lee, Young Wook Park, Byeong Kwon Ju

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Fabrication of junction-free Ag fiber electrodes for flexible organic light-emitting diodes (OLEDs) is demonstrated. The junction-free Ag fiber electrodes are fabricated by electrospun polymer fibers used as an etch mask and wet etching of Ag thin film. This process facilitates surface roughness control, which is important in transparent electrodes based on metal wires to prevent electrical instability of the OLEDs. The transmittance and resistance of Ag fiber electrodes can be independently adjusted by controlling spinning time and Ag deposition thickness. The Ag fiber electrode shows a transmittance of 91.8% (at 550 nm) at a sheet resistance of 22.3 Ω □−1, leading to the highest OLED efficiency. In addition, Ag fiber electrodes exhibit excellent mechanical durability, as shown by measuring the change in resistance under repeatable mechanical bending and various bending radii. The OLEDs with Ag fiber electrodes on a flexible substrate are successfully fabricated, and the OLEDs show an enhancement of EQE (≈19%) compared to commercial indium tin oxide electrodes.

Original languageEnglish
Article number1702567
JournalSmall
Volume14
Issue number7
DOIs
Publication statusPublished - 2018 Feb 15

Keywords

  • electrospinning
  • flexible electronics
  • metal fibers
  • organic light-emitting didoes (OLEDs)
  • transparent electrodes

ASJC Scopus subject areas

  • Biotechnology
  • Biomaterials
  • Engineering (miscellaneous)

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